Wiping out top predators messes up the climate

Wiping out top predators like lions, wolves and sharks is tragic, bad for ecosystems – and can make climate change worse. Mass extinctions of the big beasts of the jungles, grasslands and oceans could already be adding to greenhouse gases in the atmosphere.

Trisha Atwood of the University of British Columbia in Vancouver, Canada, studied the effect of removing predator fish from ponds and rivers in Canada and Costa Rica. Across a range of ecosystems, climates and predators, she found a consistent pattern: carbon dioxide emissions typically increased more than tenfold after the predators were removed.

"It looks like predators in many types of ecosystems – marine and terrestrial as well as freshwater – can play a very big role in global climate change," she told New Scientist.

The widespread and dramatic ecological impacts of the loss of top predators are well known. In the ensuing "trophic cascade", the vanished top predator's prey proliferate, which in turn puts pressure on the species that the prey eats, and so on down the food chain. In this way, changes at the top of a food chain destabilise the balance of populations right the way down.

But the geochemical impacts of trophic cascades, including any impact on emissions from ecosystems, are much less well known. Atwood's study of freshwater ecosystems showed how changes to species at the bottom of the food chain, such as photosynthesising algae, following the removal of a top predator dramatically increased the flow of CO₂ from the ecosystem to the atmosphere.

The effect will not always be to increase CO₂ emissions, however – sometimes the loss of top predators could decrease emissions, she says. "But we show that something so seemingly unrelated, like fishing all the trout from a pond or removing sharks from the ocean, could have big consequences for greenhouse-gas dynamics."

Help from kelp

Other recent studies have hinted at similar effects. Last October, Christopher Wilmers of the University of California, Santa Cruz, reported how the disappearance of sea otters is linked with increased CO₂ emissions from North American coastlines (Frontiers in Ecology and the Environment, doi.org/khz). With no otters eating them, sea urchins thrive and eat out kelp forests – often known as the "rainforests of the oceans" – resulting in major CO₂ releases.

Global climate models do not take such impacts into account yet. Atwood says they could be major, as freshwater emissions may be on a par with the influence of deforestation, which is thought responsible for around 15 per cent of human-caused CO₂ emissions.

Environmentalists will herald the findings as further evidence that it is vital to protect pristine habitats and the charismatic species at the top of their food chains. But there is a dark side. A recent study found that some island ecosystems around New Zealand store 40 per cent more carbon than others because of their top predators – invading rats that are wiping out seabird colonies. Rats, it seems, are good for the climate (Biology Letters, doi.org/bbmtw9).

Journal reference: Nature Geoscience, DOI: 10.1038/NGEO1734

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Yen weakens in Asia after G20 talks

TOKYO: The yen weakened in Asia after G20 finance ministers pledged not to devalue their currencies and avoided targeting Tokyo over the recent plunge in the Japanese unit.

Japan's policy of monetary easing has led to sharp falls in the value of the yen, sparking fears of a global currency war in which rival nations would drive down their currencies to gain a trade advantage.

In the past few months, the dollar has gained about 17 percent on the yen while the euro has jumped about 25 percent against the Japanese currency, leading to charges that Tokyo is manipulating the unit.

But the Japanese government and the Bank of Japan (BoJ) have denied orchestrating a devaluation of the yen, which weakened Monday to 93.81 against the dollar from 93.53 in New York on Friday.

It also lost ground against the euro, which bought 125.26 yen from 124.97 yen in US trade.

The euro also bought $1.3332, compared to $1.3360 in New York on Friday.

The G20 statement issued on Saturday said: "We will refrain from competitive devaluation," adding "we will not target our exchange rates for competitive purposes".

The pledge echoed a recent statement by the G7 richest nations. Neither named Tokyo as a currency manipulator.

The yen's return to a weakening trend -- after rising before the G20 talks on started -- signalled that "exchange rate shifts arising from appropriate domestic monetary and fiscal policies will not be criticised or challenged", National Australia Bank said in a note.

"But direct reference to currencies as a policy objective will be," it added.

"We believe this means the yen is free to weaken, but Japanese officials must refrain from being seen to be goading the yen to weaker levels."

The BoJ, under pressure from Japan's new conservative government, last month unveiled a plan for unlimited monetary easing and an ambitious target for two percent inflation as part of a bid to beat lingering deflation.

A number of senior Japanese officials have speculated publicly about the yen being over-valued based on its previous stronger levels.

Japan's efforts sparked charges of manipulation, particularly in Europe, but others have played down currency war fears, with the International Monetary Fund calling such talk "overblown".

Markets are also watching for the nomination of a new BoJ governor as traders bet that Prime Minister Shinzo Abe will choose a candidate who shares his desire for policy easing.

- AFP/ir

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Why Google's stores shouldn't look so much like Apple stores

Is this really different enough?

(Credit:
Crave CNET UK)

Some engineers have never dated a real person.

They've tried to, but it's hard for them to appreciate that real people don't necessarily use data to make decisions -- especially when it comes to love.

Perhaps their most embarrassing moments come when they try to mimic what non-engineers do in order to make themselves more attractive.

This mirrors some of the little issues that the Google brand has had over the years in becoming, well, human.

When you've spent you life believing that facts are everything, it's hard to imagine that people might prefer, oh, rounded corners or that ephemeral thing sometimes known as taste.

Google has made progress through some of its advertising. The "Jess Time" ad for Chrome was one of the very best tech ads of the 2012.

Yet when Google has wandered into retail, it has either believed that all you need is online or that an offline store ought to look rather like Apple's.

This is something against which Microsoft also struggles. It was almost comical when one Microsoft employee explained to me that its store looked -- at first glance -- a lot like the Apple store because the company used the same design firm.

This week, rumors surfaced that Google wants to make the next step in coming toward humanity by having its own shopping-mall retail presence.

The evidence so far from its pop-up stores -- as the picture above shows -- is that Google isn't thinking different. Or, at least, different enough.

If it fully intends to come out to the people -- to be itself-- then instead of having nice, clean retail staff in blue T-shirts (what brand does that remind you of?), it should embrace its true heart.

It should have real house-trained nerds, replete with bedhead and bad taste clothing, there for all to see. Yes, you could have nice, normal members of staff there to translate for them.

But the purpose of a retail store isn't merely to sell. It's to create street theater. Apple has its own version. Google must find its own too.

Instead of the now almost cliched clean lines and permanent white, it should make its stores look like excitable, sophisticated college playrooms, where books about dragons and vast Hulk hands are lying about and episodes of "Star Trek" and "Game of Thrones" are playing on huge screens.

More Technically Incorrect

It should expose itself fully as a brand that came out of nerdomania by parading its nerdomanic tendencies for all to see and making it lovable.

You might think this marginally insane. You might think that I am suffering from delusions of brandy.

Yet "The Big Bang Theory" has proved to be one of the most popular TV shows, not because the nerds are hidden away, but because they are in full view, with a beautiful counterpoint in a real person called Penny.

Imagine taking your kids, your lover, or your granny into a Google store and having them actually enjoy learning something about, say, comic books or Hermann von Helmholtz.

Imagine walking in and one of the Google nerds has dressed as The Flash, Batman, or Wonder Woman for the day, yet still finds a way to sell you a fascinating
Nexus 7.

In fact, wouldn't it be an excellent human resources idea, as well as a stimulus to make more uplifting products, if every Google engineer had to spend a certain period working in a Google retail store?

Mountain View should surely mine the more lofty, fantastic elements of its reality in order to create something unique and dramatic.

Otherwise, its stores might simply be accused of being Apple rip-offs.

And you know where that will ultimately end up. Yes, in front of Judge Lucy Koh.

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Meet the Meteorite Hunter

Michael Farmer is one of the world's only full-time meteorite hunters. Since the 1990s, the 40-year-old Tucson, Arizona, resident has been scouring the world for pieces of interstellar rock, racing to be the first one on the scene and selling his finds to museums and private collectors. On Friday, as Russians reportedly scrambled to collect fragments from a passing meteorite that injured hundreds, Farmer spoke with National Geographic about his unusual line of work.

Why are so many people in Russia busy gathering up meteorite fragments?

It's a historic event. This will be talked about forever. Everyone wants to have a little piece of it. And scientifically, we want to study it. We want to know what's out there, and we want to know how big it is, and we want to know what damage it can cause. The preliminary data from NASA's Jet Propulsion Laboratory says about 7,000 tons landed.

How many meteorite fragments are known to be on Earth?

There are a couple of hundred thousand known meteorites. Of course, there's millions and millions on the planet; we just have to find them. Most of the Earth is inhospitable—heavy forest, jungle, ocean. Meteorites that fall in the ocean are just gone, disappeared to the bottom.

How many other full-time meteorite hunters are there?

Dedicated, serious meteorite hunters? There are maybe 20 of us. If you add in the part-timers who go somewhere whenever [an impact is] close to them, then you might approach a hundred.

How did you become a meteorite hunter?

Here in Tucson right now we have the world's biggest mineral show going on. I bought a meteorite at this very same show 20 years ago, and I was absolutely obsessed and hooked. Since then I've been around the world more times than I can count—four million miles on American Airlines alone.

How many countries have you been to?

About 70 countries, by my last count. About 50, 59 trips to Africa—a lot of work in Africa. The Sahara and other deserts there make meteorites easier to find than on other terrains, and also keep them well preserved.

What are the challenges you face when you're on a hunt?

Well, you're usually going into a kind of chaotic scene where nobody really knows much. In Africa and other places I go [the locals] don't usually understand what's happening, and most of the time they don't care. They're more concerned with eating that day. But the instant some guy shows up and says, "I'll pay you to find this rock," the whole village empties—and then lots of rocks show up.

Related: Best Meteorites for Tourists

It can be dangerous work. I've been robbed, put into prison. For example, I was in prison two years ago in the Middle East, in Oman—actually sentenced, convicted, and put in prison for three months for "illegal mining activity." Not a very nice time. And the same year, 2011, in the fall I went to Kenya three times, after a major meteorite fell. On the third trip over I had a robbery where they ambushed us and almost murdered me. I was down on my knees, with a bag over my head and a machete on my throat and a gun at my head, being beaten. Luckily they decided to just take everything and leave instead of killing us. It's a dangerous line of work because it involves money, and people want that money.

What's the most valuable meteorite you've found?

Well, I've found three separate moon rocks in the Middle East. [Moon rocks are considered a type of meteorite that came loose from the lunar surface and fell to Earth.] And one of them I sold for $100,000 a week later. It was just a small piece—the size of a walnut. But the best meteorite I found was with my three partners up in Canada. It was actually discovered in 1931, but we went back to the location and discovered 53 kilograms [117 pounds] more. It's an extremely rare type of meteorite called a pallasite, and it's about 4.5 billion years old. We sold it to the Canadian government for just under a million dollars. Now it's in the Royal Ontario Museum, in Toronto, and it's considered a national treasure.

Where else do you sell your wares?

Well, I do shows around the world, in France, Germany, Japan. I go to expos, like this one here in Tucson, which is the biggest mineral show in the world and lasts for three weeks. And museums are always calling me.

Related: Archival Photos of Meteorite Recovery

It's a small market. It's not like I need a shop or anything. People call me or email me or go to my website and check it out. The market these days is so ravenous for anything new that when I get a new meteorite, it's usually sold in hours. I don't even have to work anymore. I just make phone calls to a few people, and it's all gone.

Where do you store your collection?

I have multiple storage sites—never put all your eggs in one basket. And I have lots of bulk material. Sometimes I buy this stuff by the ton, and it goes into storage and I sell it off one piece at a time.

What's the verification process like?

Any meteorite, anything that we want to have an official name, has to go to a laboratory, where it gets sectioned and studied by scientists. For example, I'd guess this meteorite in Russia yesterday will be in a lab in Moscow, being researched within hours.

Related: History's Big Meteorite Crashes

In the collector market, we work collaboratively with the scientists. I supply them with rocks, and they supply me with data, both of which I need to make money. People want to know what something is before they buy it.

Are there legal or ethical implications to meteorite hunting?

There always are. Certain countries have passed laws. But when I was arrested in Oman, they actually had no law—they were just very upset that we were taking lots of meteorites. The only law they could charge us with was illegal mining operations—basically running a company in the country without government licensing. But I won on appeal because we had no mining equipment. We were picking up rocks off the surface of the desert. And a judge said, "If a child could do it, then it's not mining." And I was immediately released and sent home.

But there's always friction between the collecting market and the scientific market. There are scientists out there who believe that no meteorite should be in private hands. Well, I tell you, I've been on hunts all over the world and I've only run into scientists a couple of times. They don't have the time or money to do it. So if it wasn't for us, 99 percent of these meteorites would be lost to science.

What about this meteorite strike—do you think scientists will go to Russia?

I guarantee there'll be scientists from everywhere in the world going to this one.

Are you catching the next flight to Moscow?

Well, of course as a meteorite dealer, I want to own this. I woke up this morning to a hundred e-mails from people begging me to get on a plane and go get it so they can buy a piece.

But I'm probably not going. Getting into Russia can be complicated. I'll just buy some from the Russians when it comes out.

Of course, if this had happened in China or somewhere in Africa, I'd be packing my bags right now and getting on a plane, figuring it all out when I get there.

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Pistorius Case: Agent Cancels All Future Races

Oscar Pistorius won't run in any of the future races that the athlete was contracted to compete in, but the Paraylmpic gold medalist's sponsors are still supportive as he faces a murder charge, his agent said today.

The decision to cancel Pistorius' scheduled appearances was made to "allow Oscar to concentrate on the upcoming legal proceedings and to help and support all those involved as they try to come to terms with this very difficult and distressing situation," Peet Van Zyl of In Site Athlete Management said in a statement.

"I have decided that following these tragic events that we have no option but to cancel all future races that Oscar Pistorius had been contracted to compete in," Van Zyl said.

Pistorius was slated to compete in races in Australia and Brazil, as well as at the Drake Relays in Iowa and the Manchester City Games in the U.K.

Van Zyl also said that Pistorius' sponsors and partners are supportive.

"I can confirm that at this point in time, all parties are supportive and their contractual commitments are maintained. They have said they are happy to let the legal process takes its course before making any change in their position," Van Zyl said in the statement.

However, M-Net movies, a subscription-funded South African television channel has pulled their ad campaign featuring Pistorius, tweeting, "Out of respect & sympathy to the bereaved, M-Net will be pulling its entire Oscar campaign featuring Oscar Pistorius with immediate effect."

The agent's announcement comes as family and friends rallied to Pistorius' defense -- saying they believe the Paralympic gold medalist's story that he shot his model girlfriend Reeva Steenkamp by accident after he mistook her for an intruder.

Adrian Dennis/AFP/Getty Images; Mike Holmes/The Herald/Gallo Images/Getty Images

'Blade Runner' Murder Mystery: Family Speaks Out Watch Video

'Blade Runner' on Suicide Watch After Charged With Girlfriend's Murder Watch Video

Oscar Pistorius Charged in Shooting Death of Girlfriend Watch Video

"When you are a sportsman, you act even more on instinct ... it's instinct -- things happen and that's what you do," Pistorius' father Henke Pistorius, 59, told The Telegraph.

The 26-year-old athlete, known as the "Blade Runner" because of the carbon-fiber blades he runs on, was charged Friday with premeditated murder.

PHOTOS: Paralympic Champion Charged With Murder

If convicted, Pistorius could face at least 25 years in jail.

"All of us saw at firsthand how close [Steenkamp] had become to Oscar during that time and how happy they were. They had plans together and Oscar was happier in his private life than he had been for a long time," Pistorius' uncle Arnold Pistorius said on Saturday.

According to South African newspaper Beeld, Steenkamp was killed nearly two hours after police were called to Pistorius' home to respond to reports of an argument at the complex.

Police said they have responded to disputes at the sprinter's residence before, but did not say whether Steenkamp was involved.

The athlete's best friend said Pistorius called him after the shooting to say "there has been a terrible accident, I shot Reeva," Justin Divaris told the Sunday People.

While his family insists he is not a murderer, prosecutors disagree.

Police sources told local media that Steenkamp was shot through the bathroom door where she may have been trying to hide to save herself.

Reeva Steenkamp

A memorial service for Steenkamp will be held in Port Elizabeth on Tuesday evening, SABC reported. Her body will be flown back for the service before being cremated, her family said.

"Her future has been cut short ... I dare say she's with the angels," said Mike Steenkamp, Reeva Steenkamp's uncle.

The South African reality show Steenkamp competed in premiered Saturday night on SABC as planned and included a special tribute to the slain law school graduate whose modeling career was starting to take off.

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False memories prime immune system for future attacks

IN A police line-up, a falsely remembered face is a big problem. But for the body's police force – the immune system – false memories could be a crucial weapon.

When a new bacterium or virus invades the body, the immune system mounts an attack by sending in white blood cells called T-cells that are tailored to the molecular structure of that invader. Defeating the infection can take several weeks. However, once victorious, some T-cells stick around, turning into memory cells that remember the invader, reducing the time taken to kill it the next time it turns up.

Conventional thinking has it that memory cells for a particular microbe only form in response to an infection. "The dogma is that you need to be exposed," says Mark Davis of Stanford University in California, but now he and his colleagues have shown that this is not always the case.

The team took 26 samples from the Stanford Blood Center. All 26 people had been screened for diseases and had never been infected with HIV, herpes simplex virus or cytomegalovirus. Despite this, Davis's team found that all the samples contained T-cells tailored to these viruses, and an average of 50 per cent of these cells were memory cells.

The idea that T-cells don't need to be exposed to the pathogen "is paradigm shifting," says Philip Ashton-Rickardt of Imperial College London, who was not involved in the study. "Not only do they have capacity to remember, they seem to have seen a virus when they haven't."

So how are these false memories created? To a T-cell, each virus is "just a collection of peptides", says Davis. And so different microbes could have structures that are similar enough to confuse the T-cells.

To test this idea, the researchers vaccinated two people with an H1N1 strain of influenza and found that this also stimulated the T-cells to react to two bacteria with a similar peptide structure. Exposing the samples from the blood bank to peptide sequences from certain gut and soil bacteria and a species of ocean algae resulted in an immune response to HIV (Immunology, doi.org/kgg).

The finding could explain why vaccinating children against measles seems to improve mortality rates from other diseases. It also raises the possibility of creating a database of cross-reactive microbes to find new vaccination strategies. "We need to start exploring case by case," says Davis.

"You could find innocuous pathogens that are good at vaccinating against nasty ones," says Ashton-Rickardt. The idea of cross-reactivity is as old as immunology, he says. But he is excited about the potential for finding unexpected correlations. "Who could have predicted that HIV was related to an ocean algae?" he says. "No one's going to make that up!"

This article appeared in print under the headline "False memories prime our defences"

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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"Argo", "Lincoln" vie for Oscars crown in open race

LOS ANGELES - Steven Spielberg goes into next weekend's Oscars with the most nominations for his presidential "Lincoln" but the momentum is all with Ben Affleck's thriller "Argo" in the Academy Awards home straight.

And while the Hollywood veteran and the young pretender vie for the Oscars best picture crown, several other frontrunners remain hard on their heels, in one of the least predictable Oscar races in recent memory.

Taiwan-born Lee Ang's 3D spectacular "Life of Pi," Osama bin Laden manhunt movie "Zero Dark Thirty" and romcom "Silver Linings Playbook" could all be in with a chance at the Oscars, the climax of Tinseltown's annual awards season.

Spielberg and Lee are frontrunners for best director, while "Lincoln" star Daniel Day-Lewis is widely seen as a shoo-in for best actor. For best actress the hot money is on Jessica Chastain for her part in "Zero Dark Thirty" or "Hunger Games" star Jennifer Lawrence.

But Affleck's Iran hostage drama, despite only winning seven nominations -- against 12 for "Lincoln," 11 for "Life of Pi" and eight each for "Silver Linings Playbook" and "Les Miserables" -- has a clear edge for best picture.

It has swept up top prizes at a string of key awards shows, including the Golden Globes, the Screen Actors Guild (SAG), Producers Guild of America (PGA), the Directors Guild of America (DGA), and Britain's BAFTA last weekend.

Affleck has gotten used to making acceptance speeches over the last two months -- but he has been tightlipped on his prospects for the all-important 85th Academy Awards, to be held at Hollywood's Dolby Theatre next Sunday.

"I just feel so incredibly honoured to be nominated as a producer for this movie. To be here at the big party," he said at the Oscar Nominees Luncheon, the annual gathering of those in the race, held in Beverly Hills on February 4.

Indeed, his best picture nomination is as a co-producer of the film -- along with George Clooney and Grant Heslov -- rather than as a director, a category in which he was not nominated, in a perceived snub.

Snub or no snub, he will be among presenters at the show, along with a Who's Who of A-listers including Halle Berry, Sandra Bullock, Nicole Kidman, Reese Witherspoon, Robert Downey Jr, Samuel L Jackson, and Meryl Streep.

"Family Guy" creator Seth MacFarlane will be hosting, a move organizers hope will attract younger viewers among the hundreds of millions watching live around the world.

Other nominees presenting include Chastain -- best actress frontrunner for playing a relentless CIA agent on the hunt for Osama, in Oscar-winning director Kathryn Bigelow's controversial "Zero Dark Thirty".

But Lawrence, star of the "Hunger Games" blockbuster franchise, could also win the category for her portrayal of mixed-up Tiffany to Bradley Cooper's bipolar ex-teacher in "Silver Linings Playbook".

Cooper is up for best actor, along with Hugh Jackman for "Les Miserables", Joaquin Phoenix for "The Master" and Denzel Washington for "Flight" -- but Day-Lewis is widely forecast for a record third Oscar for his "Lincoln" turn.

For best director, 66-year-old Spielberg will be hoping for his first Oscar since "Saving Private Ryan" in 1999.

But he is up against Lee -- whose "Brokeback Mountain" won best picture in 2006 -- as well as Michael Haneke for his Cannes-winning "Amour", David O Russell for "Silver Linings Playbook" and Benh Zeitlin for "Beasts of the Southern Wild".

Best supporting actor nominees are Alan Arkin for "Argo", Robert De Niro for "Silver Linings Playbook", Philip Seymour Hoffman for "The Master", Tommy Lee Jones for "Lincoln" and Christoph Waltz for "Django Unchained".

For supporting actress Anne Hathaway is tipped to win for performance in "Les Miserables" -- including her heart-wrenching close-up rendition of "I Dreamed a Dream" -- against Amy Adams for "The Master", Sally Field in "Lincoln", Helen Hunt in "The Sessions" and Jacki Weaver in "Silver Linings Playbook".

The Oscars have a musical theme this year, including a performance by Britain's Adele singing the Oscar-nominated 007 theme tune "Skyfall" as well as by Shirley Bassey and Norah Jones, and Barbra Streisand, in her first Oscars turn since 1977.

- AFP/ir

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Russian meteorite: The conspiracy theories

A strange time for a military attack?

(Credit:
CNN; screenshot by Chris Matyszczyk/CNET)

A good hearty conspiracy theory can shine a sharp light on two of humanity's most enduring traits.

One, of course, is humanity's boundless imagination. The other is humanity's essential suspicion of humanity.

So while you might be deeply immersed in Bill Nye's explanation of the Russian meteorite, those with darker sensibilities have filled the Web with their fears and hauntings about the phenomenon.

There are few nations with greater awareness of dark sensibilities than Russia. The fact that there seems to be little evidence of meteorite fragments on the ground has encouraged some Russians to offer their own suspicions.

As the Toronto Globe and Mail reports, nationalist leader Vladimir Zhirinovsky hasn't been slow to offer something of a Hot War perspective.

"It's not meteors falling. It's a new weapon being tested by the Americans," he was quoted as saying.

We know from our recent experience of North Korea that weapons testing is an imprecise science.

But if you were an American in the mood to test a weapon, would Chelyabinsk, Russia, be your very first choice of place for the experiment?

Perhaps Tallahassee; Area 51; and Bialystok, Poland, were all unavailable due to prior commitments. Or perhaps it wasn't the Americans, but, say, the North Koreans, who mistook Chelyabinsk for, say, Chelsea.

Zhirinovsky's rather emotionally manipulative offering was countered by Russia's Emergency Ministry, which dedicated itself to an extensive rebuttal of his belief (and that of others) that this was some sort of military thing. The rebuttal? "Rubbish."

But that wasn't going to put off the local media, was it? Not only do they have papers to sell, they also have theories to expound to a troubled nation and world.

So, as The Atlantic reports, the local Znak newspaper accepted that this was a meteorite but insisted the explosion was caused by military defense blowing it up.

More Technically Incorrect

Yes, of course it has a source in the military. You thought it didn't?

Though I've watched a few movies in which exciting things happen, I don't find it easy to imagine that some sort of terrestrially created missile-laden aircraft could really explode a meteorite in such a manner.

It is easier to imagine, though, that politicians like Zhirinovsky might take the opportunity to foment a little rage.

Indeed, Alex Jones' infamously well-guarded Infowars site offered that Zhirinovsky insisted that America -- in the person of Secretary of State John Kerry -- had tried to give Russia advance notice of its "attack."

The Drudge Report led me to a piece at Foreign Policy that explained that Sergey Lavrov, Russia's foreign minister, simply hadn't called Kerry back.

Which all suggests that Russia isn't, after all, living in fear of an attack from the U.S. Especially one over Chelyabinsk.

On balance, I prefer to currently believe Nye. He is the science guy, after all. And science guys know scientific events when they see them.

I hope.

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Picture Archive: Making Mount Rushmore, 1935-1941

Photograph from Rapid City Chamber of Commerce/National Geographic

There's no such thing as Presidents' Day.

According to United States federal government code, the holiday is named Washington's Birthday, and has been since it went nationwide in 1885.

But common practice is more inclusive. The holiday expanded to add in other U.S. presidents in the 1960s, and the moniker Presidents' Day became popular in the 1980s and stuck. It may be that George Washington (b. February 22, 1732) andAbraham Lincoln (b. February 12, 1809) still get the lion's share of attention—and appear in all the retail sale ads—on the third Monday in February, but the popular idea is that all 44 presidents get feted.

Mount Rushmore is a lot like that one day a year writ large—and in granite. It's carved 60 feet (18 meters) tall and 185 feet (56 meters) wide, from Washington's right ear to Lincoln's left.

The monument's sculptor, Gutzon Borglum, grew up in Idaho, a first-generation American born to Danish parents. He studied art in France and became good friends with Auguste Rodin. Borglum mostly worked in bronze, but in the early 1910s he was hired to carve the likenesses of Confederate leaders into Stone Mountain in Georgia.

He was about to be fired from that job for creative differences about the same time that a South Dakota historian named Doane Robinson had an idea. Robinson wanted to have a monument carved into the Black Hills of South Dakota, maybe Western historical figures like Chief Red Cloud and Lewis and Clark, each on their own granite spire. (Plan a road trip in the Black Hills.)

Robinson hired Borglum and gave him carte blanche. Borglum was looking for something with national appeal, so he chose to depict four presidents: George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln.

Borglum wanted to represent the first 150 years of the nation's history, choosing four presidents as symbols of their respective time periods. He took a tour of western South Dakota, searching for an ideal canvas.

The sculptor was looking for three things: a surface strong enough to sculpt, a mountain big enough to hold several figures, and a mountain face that received morning sunlight. Mount Rushmore fit the bill and was already part of a national forest, so it was easy to set aside as a national memorial.

Work started in 1927. Calvin Coolidge attended the dedication ceremony. It took 14 years to finish the carving, conducted mostly in summertime because of the area's harsh winters.

There were approximately 30 workers on the mountain at any give time. In total about 400 had worked on it by the time the monument was finished. Though the project involved thousands of pounds of dynamite and perilous climbs, not a single person died during the work.

Borglum himself died of natural causes in 1941, though, just six months before the project was declared "closed as is" by Congress that Halloween. His son Lincoln—named for his father's favorite president—took over.

In the photo above, a worker refines the details of Washington's left nostril.

About 90 percent of the mountain was carved using dynamite, which could get within 3 to 5 inches (8 to 13 centimeters) of the final facial features. For those last few inches, workers used what was known as the honeycomb method: Jackhammer workers pounded a series of three-inch-deep holes followed up by chiselers who knocked off the honeycomb pieces to get the final shape. Then carvers smoothed the "skin's" surface.

—Johnna Rizzo

February 16, 2013

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Meteor Blast 'Something We Only Saw in Movies'

A day after a massive meteor exploded over this city in central Russia, a monumental cleanup effort is under way.

Authorities have deployed around 24,000 troops and emergencies responders to help in the effort.

Officials say more than a million square feet of windows -- the size of about 20 football fields -- were shattered by the shockwave from the meteor's blast. Around 4,000 buildings in the area were damaged.

The injury toll climbed steadily on Friday. Authorities said today it now stands at more than 1,200. Most of those injuries were from broken glass, and only a few hundred required hospitalization.

According to NASA, this was the biggest meteor to hit Earth in more than a century. Preliminary figures suggest it was 50 feet wide and weighed more than the Eiffel Tower.

SEE PHOTOS: Meteorite Crashes in Russia

NASA scientists have also estimated the force of the blast that occurred when the meteor fractured upon entering Earth's atmosphere was approximately 470 kilotons -- the equivalent of about 30 Hiroshima bombs.

Residents said today they still can't believe it happened here.

"It was something we only saw in the movies," one university student said. "We never thought we would see it ourselves."

Throughout the city, the streets are littered with broken glass. Local officials have announced an ambitious pledge to replace all the broken windows within a week. In the early morning hours, however, workers could still be heard drilling new windows into place.

Authorities have sent divers into a frozen lake outside the city, where a large chunk of the meteor is believed to have landed, creating a large hole in the ice. By the end of the day they had not found anything.

They are not the only ones looking for it.

Meteor hunters from around the world are salivating at what some are calling the opportunity of a lifetime. A small piece of the meteor could fetch thousands of dollars and larger chunks could bring in even hundreds of thousands.

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