Today on New Scientist: 21 December 2012

Cadaver stem cells offer new hope of life after death

Stem cells can be extracted from bone marrow five days after death to be used in life-saving treatments

Apple's patents under fire at US patent office

The tech firm is skating on thin ice with some of the patents that won it a $1 billion settlement against Samsung

Himalayan dam-building threatens endemic species

The world's highest mountains look set to become home to a huge number of dams - good news for clean energy but bad news for biodiversity

Astrophile: Black hole exposed as a dwarf in disguise

A white dwarf star caught mimicking a black hole's X-ray flashes may be the first in a new class of binary star systems

Blind juggling robot keeps a ball in the air for hours

The robot, which has no visual sensors, can juggle a ball flawlessly by analysing its trajectory

Studio sessions show how Bengalese finch stays in tune

This songbird doesn't need technological aids to stay in tune - and it's smart enough to not worry when it hears notes that are too far off to be true

Giant tooth hints at truly monumental dinosaur

A lone tooth found in Argentina may have belonged to a dinosaur even larger than those we know of, but what to call it?

Avian flu virus learns to fly without wings

A strain of bird flu that hit the Netherlands in 2003 travelled by air, a hitherto suspected by unproven route of transmission

Feedback: Are wind turbines really fans?

A tale of "disease-spreading" wind farms, the trouble with quantifying "don't know", the death of parody in the UK, and more

The link between devaluing animals and discrimination

Our feelings about other animals have important consequences for how we treat humans, say prejudice researchers Gordon Hodson and Kimberly Costello

Best videos of 2012: First motion MRI of unborn twins

Watch twins fight for space in the womb, as we reach number 6 in our countdown of the top videos of the year

2012 Flash Fiction winner: Sleep by Richard Clarke

Congratulations to Richard Clarke, who won the 2012 New Scientist Flash Fiction competition with a clever work of satire

Urban Byzantine monks gave in to temptation

They were supposed to live on an ascetic diet of mainly bread and water, but the monks in 6th-century Jerusalem were tucking into animal products

The pregnant promise of fetal medicine

As prenatal diagnosis and treatment advance, we are entering difficult ethical territory

2013 Smart Guide: Searching for human origins in Asia

Africa is where humanity began, where we took our first steps, but those interested in the latest cool stuff on our origins should now look to Asia instead

The end of the world is an opportunity, not a threat

Don't waste time bemoaning the demise of the old order; get on with building the new one

Victorian counting device gets speedy quantum makeover

A photon-based version of a 19th-century mechanical device could bring quantum computers a step closer

Did learning to fly give bats super-immunity?

When bats first took to the air, something changed in their DNA which may have triggered their incredible immunity to viruses

Van-sized space rock is a cosmic oddball

Fragments from a meteor that exploded over California in April are unusually low in amino acids, putting a twist on one theory of how life on Earth began

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Football: Barca battle on without Vilanova for time being

MADRID: Barcelona will have to continue their march at the top of La Liga without Tito Vilanova after it was revealed the coach has suffered a relapse of a tumour on which he was operated just over a year ago.

The 44-year-old who took over from Pep Guardiola at the beginning of the season was thought to have fully recovered from surgery last November to remove the growth on his parotid gland, and he was back at work within 15 days.

However after an operation on Thursday it is thought he will have treatment for at least six weeks and he may or may not be available to return to work at some stage during that time.

Until then, Sporting director Andoni Zubizarreta confirmed on Thursday, the side will be led by Vilanova's assistant Jordi Roura.

"Without going into too much detail about the sporting side today and whether we win or not at Valladolid on Saturday, just to say we'll continue with our coaching staff and our way of working, we'll be in extraordinary hands and Tito I'm sure will be watching us on TV," he said.

Barca president Sandro Rossell added "the most important thing for the club at this moment is the full recovery of Tito".

Vilanova has led Barcelona to the most successful start to a season in La Liga's history, with 15 wins and one draw in 16 matches so far.

With the final round of La Liga games of 2012 brought forward to allow the players an extra day of Christmas holidays, Barca will make it a great finish to the year, on the pitch at least, if they take three points at Valladolid.

Last weekend's win over closest rivals Atletico Madrid increased the Catalan side's lead to nine points and with Real Madrid's surprise draw with Espanyol leaving them 13 points back in third, for some La Liga title is already destined for the Nou Camp in May.

That win was followed with the news on Monday that Carles Puyol and Xavi Hernandez will stay at Barca until at least 2016 and Lionel Messi until 2018, and it was all looking positive until Wednesday's shock news.

Last Sunday's clear dominance over their closest rivals Atletico Madrid, especially in the second-half of the 4-1 win, left most observers concluding that it is the Catalan side's title to lose.

Meanwhile, Real Madrid face a tricky trip to fourth placed Malaga less than a week after manager Jose Mourinho said the title was "almost impossible now".

Defeats at Getafe, Sevilla and Betis, followed by the draw with Espanyol last Sunday, have left Madrid far adrift from table-toppers Barca.

One player the 'Merengues' missed last Sunday was French forward Karim Benzema.

Benzema is closer to a return than colleague Gonzalo Higuain, but could still miss the trip to Malaga with a foot injury. However he has pledged his future to the club this week, despite his name being linked with Paris Saint-Germain.

Malaga come into the game with the best defensive record in the league having conceded only 10 goals in 16 games and full-back Nacho Monreal is confident.

"We're going to be up for the Madrid match, we're doing well, we're at home and we know that Madrid is not going too good, but they're a good team and it will be difficult. I just hope we can take our chances and get the three points," he said.

In this week's matches already played, Rayo Vallecano beat Levante 3-0, Real Sociedad edged Sevilla 2-1 and Espanyol defeated Deportivo La Coruna 2-0, on Thursday.

On Friday, substitute Adrian Lopez hit an important winner as Atletico Madrid beat Celta Vigo 1-0.

Their win, Atletico's ninth straight victory at home this season, moves the club from the capital to within six points of Barca, in second position.

Earlier on Friday, Valencia beat Getafe 4-2 at home to make it two wins out of three for new manager Ernesto Valverde.

Saturday's fixtures:
Betis v Mallorca (1500 GMT), Valladolid v Barcelona (1700 GMT), Osasuna v Granada (1900 GMT), Malaga v Real Madrid (1900 GMT), Athletic Bilbao v Zaragoza (2100 GMT)

- AFP/al

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Why does my external hard drive only show 2.2TB?

External hard drives are exceptionally useful for expanding storage capabilities for both backups and data management. While external hard drives are often sold in preconfigured packages by manufacturers, another popular option is to purchase an external hard-drive enclosure and then use any drive of your choice in it. This is beneficial because as your demands for storage increase, you can replace the enclosure's drive with a larger one.

These days, the availability of hard drives with 4TB of storage are enticing for people to swap into their existing enclosures; however, when doing so they may find that the system will only recognize 2.2TB of the drive, regardless of how they partition or format the device.

While modern file-system formats such as HFS+, NTFS, and ExFAT ought to handle volume sizes of between hundreds of gigabytes to zettabytes, and though operating systems like OS X have increased the maximum volume size from 2TB to 8EB (exabytes) over the years, there are hardware limitations that may limit the size of the volume that can be used. If you are using an older drive enclosure for your large hard drive, then the controllers on it may not be capable of handling over 2.2TB, regardless of the software environment being used around it.

This problem happens because of the use of LBA (logical block addressing) in modern hard-drive controllers coupled with a hardware-based limit of how many blocks can be included in the LBA scheme. Early LBA controllers used 32-bit (or lower) addressing coupled with a maximum supported block size of 512 bytes. This means they support up to 2^32 or 4,294,967,296 blocks for a device, and with each block being 512 bytes, this translates to a maximum of 2,199,023,255,552 bytes, or 2.199TB.

Unfortunately in many cases these limits are hard-coded in enclosure's firmware, so even though modern drives use 4,096-byte sectors, the system will still only address these sectors as 512 bytes in size, resulting in both a waste of space and degraded performance.

The only way around this problem is to replace your drive enclosure with a new one that has proper support for both 48-bit (or greater) LBA and 4,096-byte sectors in hard drives. Luckily most enclosures on the market today do support this, so if you run into this problem, you should be up and running in no time.

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Pictures: Fungi Get Into the Holiday Spirit

Photograph courtesy Stephanie Mounaud, J. Craig Venter Institute

Mounaud combined different fungi to create a Santa hat and spell out a holiday message.

Different fungal grow at different rates, so Mounaud's artwork rarely lasts for long. There's only a short window of time when they actually look like what they're suppose to.

"You do have to keep that in perspective when you're making these creations," she said.

For example, the A. flavus fungi that she used to write this message from Santa grows very quickly. "The next day, after looking at this plate, it didn't say 'Ho Ho Ho.' It said 'blah blah blah,'" Mounaud said.

The message also eventually turned green, which was the color she was initially after. "It was a really nice green, which is what I was hoping for. But yellow will do," she said.

The hat was particularly challenging. The fungus used to create it "was troubling because at different temperatures it grows differently. The pigment in this one forms at room temperature but this type of growth needed higher temperatures," Mounaud said.

Not all fungus will grow nicely together. For example, in the hat, "N. fischeri [the brim and ball] did not want to play nice with the P. marneffei [red part of hat] ... so they remained slightly separated."

Published December 21, 2012

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Obama Still an 'Optimist' on Cliff Deal

Mandel Ngan/AFP/Getty Images

WASHINGTON D.C. – Ten days remain before the mandatory spending cuts and tax increases known as the “fiscal cliff” take effect, but President Obama said he is still a “hopeless optimist” that a federal budget deal can be reached before the year-end deadline that economists agree might plunge the country back into recession.

“Even though Democrats and Republicans are arguing about whether those rates should go up for the wealthiest individuals, all of us – every single one of us -agrees that tax rates shouldn’t go up for the other 98 percent of Americans, which includes 97 percent of small businesses,” he said.

He added that there was “no reason” not to move forward on that aspect, and that it was “within our capacity” to resolve.

The question of whether to raise taxes on incomes over $250,000 remains at an impasse, but is only one element of nuanced legislative wrangling that has left the parties at odds.

For ABC News’ breakdown of the rhetoric versus the reality, click here.

At the White House news conference this evening, the president confirmed he had spoken today to Senate Majority Leader Harry Reid, D-Nev., and House Speaker John Boehner, R-Ohio, although no details of the conversations were disclosed.

The talks came the same day Speaker Boehner admitted “God only knows” the solution to the gridlock, and a day after mounting pressure from within his own Republican Party forced him to pull his alternative proposal from a prospective House vote. That proposal, ”Plan B,” called for extending current tax rates for Americans making up to $1 million a year, a far wealthier threshold than Democrats have advocated.

Boehner acknowledged that even the conservative-leaning “Plan B” did not have the support necessary to pass in the Republican-dominated House, leaving a resolution to the fiscal cliff in doubt.

“In the next few days, I’ve asked leaders of Congress to work towards a package that prevents a tax hike on middle-class Americans, protects unemployment insurance for 2 million Americans, and lays the groundwork for further work on both growth and deficit reduction,” Obama said. ”That’s an achievable goal.  That can get done in 10 days.”

Complicating matters: The halls of Congress are silent tonight. The House of Representatives began its holiday recess Thursday and Senate followed this evening.

Meanwhile, the president has his own vacation to contend with. Tonight, he was embarking for Hawaii and what is typically several weeks of Christmas vacation.

However, during the press conference the president said he would see his congressional colleagues “next week” to continue negotiations, leaving uncertain how long Obama plans to remain in the Aloha State.

The president said he hoped the time off would give leaders “some perspective.”

“Everybody can cool off; everybody can drink some eggnog, have some Christmas cookies, sing some Christmas carols, enjoy the company of loved ones,” he said. “And then I’d ask every member of Congress, while they’re back home, to think about that.  Think about the obligations we have to the people who sent us here.

“This is not simply a contest between parties in terms of who looks good and who doesn’t,” he added later. “There are real-world consequences to what we do here.”

Obama concluded by reiterating that neither side could walk away with “100 percent” of its demands, and that it negotiations couldn’t remain “a contest between parties in terms of who looks good and who doesn’t.”

Boehner’s office reacted quickly to the remarks, continuing recent Republican statements that presidential leadership was at fault for the ongoing gridlock.

“Though the president has failed to offer any solution that passes the test of balance, we remain hopeful he is finally ready to get serious about averting the fiscal cliff,” Boehner said. “The House has already acted to stop all of the looming tax hikes and replace the automatic defense cuts. It is time for the Democratic-run Senate to act, and that is what the speaker told the president tonight.”

The speaker’s office said Boehner “will return to Washington following the holiday, ready to find a solution that can pass both houses of Congress.”

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Van-sized space rock is a cosmic oddball

The shattered remains of a high-profile space rock are oddly low in organic materials, the raw ingredients for life. The discovery adds a slight wrinkle to the theory that early Earth was seeded with organics by meteorite impacts.

In April a van-sized meteor was seen streaking over northern California and Nevada in broad daylight. The fireball exploded with a sonic boom and sprayed the region with fragments. Videos, photographs and weather radar data allowed the meteor's trajectory to be reconstructed, and teams quickly mobilised to search for pieces in the foothills of the Sierra Nevada in northern California.

Researchers readily identified the meteorites as rare CM chondrites, thought to be one of the oldest types of rock in the universe. "Because the meteorites were discovered so freshly, for the first time we had a chance to study this type of meteorite in a pristine form," says Peter Jenniskens of the SETI Institute in Mountain View, California, who led the search effort and the subsequent study of the space rocks.

Jenniskens personally found a fragment in a parking lot, where it remained relatively free of soil contaminants. "That's the best you could hope for, other than landing in a freezer," says Daniel Glavin of NASA's Goddard Space Flight Center in Greenbelt, Maryland.

Battered past

CM chondrites make up only about 1 per cent of known meteorites. Most of them contain plenty of organic materials, including amino acids, the building blocks of life on Earth.

Jenniskens and colleagues found that the California fragments also have amino acids, including some not found naturally on Earth. But in three rocks collected before a heavy rainstorm, which bathed the other pieces in earthly contaminants, organics are less abundant by a factor of 1000 than in previously studied CM chondrites.

These three rocks could not have lost organics due to space "weathering": analysis of the meteorites' exposure to cosmic rays suggests the original meteor was flying through space for only about 50,000 years before hitting Earth.

Based on its trajectory and its relatively short flight time, Jenniskens thinks the meteor can be traced back to a family of asteroids dominated by 495 Eulalia, a group known as a possible source of CM chondrites. It is probably a piece that broke off during an impact, revealing the relatively pristine material inside.

So what happened to its organics? Jenniskens' team found that the meteorites are breccia – smaller rocks cemented together – which suggests that the asteroid from which they came took a series of beatings. Those impacts, or possibly other processes inside the asteroid, could have heated it enough to destroy most organic material.

Limited delivery

The result might have implications for the organics delivery theory, says Bill Bottke of the Southwest Research Institute in Boulder, Colorado.

"It shows that not all asteroids can deliver sufficient quantities. One of the disappointments is that, from a prebiotic organic chemistry perspective, it was very limited," says Bottke. "But this is an unusual case. Most [CM chondrites] are loaded with organic compounds."

Still, studying the space rocks will help us prepare future missions to asteroids such as OSIRIS-Rex, scheduled to take off for asteroid 1999 RQ36 in 2016 and bring a sample back in 2023.

"In some ways, we've had a sample, a very fresh one, come to us," says Bottke. "This is a test bed for the techniques we'll use in that mission."

Journal reference: Science, DOI: 10.1126/science.1227163

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Apple reportedly pulls plug on project behind portable charger

The POP portable charging station.

The technology lab behind a Kickstarter-funded project to build a portable device charging station announced today it will refund its crowdfunded $139,170 to donors after Apple refused to license rights to its Lightning connector.

POP, a minimalist portable power station, was billed as "the intersection of charging design" and was expected to feature four retractable cords for charging a variety of devices, including iOS and
Android devices. The portable charging station featured a 26,000 mAh battery capable of charging 10 iPhones, according to Junior Edison, the company behind the effort.

In addition to its portable convenience, Junior Edison touted POP as a device that would aid survival when natural disasters kill power, offering many days of charging power for portable devices.

However, Apple was not charged over having its proprietary connector combined with micro-USB connectors, according to Junior Edison Jamie Siminoff.

"After applying to Apple (which is now required for Lightning), we learned that they are no longer willing to approve a product that uses the Lightning charger alongside any other charger (including their own 30-pin - seriously)," he said in a blog post on Kickstarter. "Just like that, POP could no longer fulfill its true promise."

CNET has contacted Apple for comment and will update this report when we learn more.

Unveiled in September, Lightning replaced the 30-pin adapters that date back to early iPods. Its key benefit is the smaller iPhone connector, which is 80 percent smaller than the previous connector. However, the new technology also represented a costly change for people who have multiple cables that they use in their
car, home, or at work.

Edison Junior video of the device:

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Hollies Get Prickly for a Reason

With shiny evergreen leaves and bright red berries, holly trees are a naturally festive decoration seen throughout the Christmas season.

They're famously sharp. But not all holly leaves are prickly, even on the same tree. And scientists now think they know how the plants are able to make sharper leaves, seemingly at will. (Watch a video about how Christmas trees are made.)

A new study published in the Botanical Journal of the Linnean Society suggests leaf variations on a single tree are the combined result of animals browsing on them and the trees' swift molecular response to that sort of environmental pressure.

Carlos Herrera of the National Research Council of Spain led the study in southeastern Spain. He and his team investigated the European holly tree, Ilex aquifolium. Hollies, like other plants, can make different types of leaves at the same time. This is called heterophylly. Out of the 40 holly trees they studied, 39 trees displayed different kinds of leaves, both prickly and smooth.

Five holly leaves from the same tree.

Photographs by Emmanuel Lattes, Alamy

Some trees looked like they had been browsed upon by wild goats and deer. On those trees, the lower 8 feet (2.5 meters) had more prickly leaves, while higher up the leaves tended to be smooth. Scientists wanted to figure out how the holly trees could make the change in leaf shape so quickly.

All of the leaves on a tree are genetic twins and share exactly the same DNA sequence. By looking in the DNA for traces of a chemical process called methylation, which modifies DNA but doesn't alter the organism's genetic sequence, the team could determine whether leaf variation was a response to environmental or genetic changes. They found a relationship between recent browsing by animals, the growth of prickly leaves, and methylation.

"In holly, what we found is that the DNA of prickly leaves was significantly less methylated than prickless leaves, and from this we inferred that methylation changes are ultimately responsible for leaf shape changes," Herrera said. "The novelty of our study is that we show that these well-known changes in leaf type are associated with differences in DNA methylation patterns, that is, epigenetic changes that do not depend on variation in the sequence of DNA."

"Heterophylly is an obvious feature of a well-known species, and this has been ascribed to browsing. However, until now, no one has been able to come up with a mechanism for how this occurs," said Mike Fay, chief editor of the Botanical Journal of the Linnean Society and head of genetics at the Kew Royal Botanic Gardens. "With this new study, we are now one major step forward towards understanding how."

Epigenetic changes take place independently of variation in the genetic DNA sequence. (Read more about epigenetics in National Geographic magazine's "A Thing or Two About Twins.")

"This has clear and important implications for plant conservation," Herrera said. In natural populations that have their genetic variation depleted by habitat loss, the ability to respond quickly, without waiting for slower DNA changes, could help organisms survive accelerated environmental change. The plants' adaptability, he says, is an "optimistic note" amidst so many conservation concerns. (Related: "Wild Holly, Mistletoe, Spread With Warmer Winters.")

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Boehner Pulls Plan B Option

In a surprise development late Thursday night, House Speaker John Boehner pulled his so-called "Plan B option" -- an extension of current tax rates for Americans making up to $1 million a year -- from the House floor, admitting that it did not have the support necessary to pass and leaving a resolution to the fiscal cliff in question.

"The House did not take up the tax measure today because it did not have sufficient support from our members to pass. Now it is up to the president to work with [Democratic Senate Majority Leader Harry] Reid on legislation to avert the fiscal cliff," Boehner, R-Ohio, wrote in a statement. "The House has already passed legislation to stop all of the Jan. 1 tax rate increases and replace the sequester with responsible spending cuts that will begin to address our nation's crippling debt. The Senate must now act."

Immediately after the announcement that "plan B" had failed, Dow Jones Industrial futures traded down, with other stock indicators also signaling sharp losses and volatility for Friday morning's opening -- though stock futures generally are lightly traded in the evening. Indicators soon bounced off the initial lows but still signaled a rough start to the final trading session of the week.

In Washington, all legislative business has concluded for the week. House Majority Leader Eric Cantor's office said that members could still return "after the Christmas holiday when needed" if a breakthrough is eventually reached.

Jacquelyn Martin/AP Photo

Outgoing Sen. Joe Lieberman Criticizes Colleagues for Putting Party Above Country Watch Video

President Obama Promises Action to Reduce Gun Violence Watch Video

The outlook for a deal to avert the "fiscal cliff" by Christmas has reached a new low, with no clear path forward, though lawmakers and the White House maintained hope this week for a deficit-reduction compromise by the end of the year.

A senior aide to the speaker confirmed late Thursday evening that Boehner and Obama still have not spoken since Monday evening, when the speaker told the president that he would move ahead with his backup plan, although staff-level talks have continued behind the scenes.

"Speaker Boehner tried to play hardball by asking his members to vote for a tax increase. He learned the hard way that you must find a bipartisan solution," one senior House Democratic leadership aide said reacting to the developments. "Walking away has considerably weakened him and put the country literally on the precipice of the cliff."

Republicans had sought to act to avoid an income tax hike on 99 percent of Americans in 2013, and leverage new pressure on President Obama in the ongoing talks for a broader "cliff" deal.

Obama has threatened to veto the legislation, calling it counterproductive and the cuts burdensome for the middle class, and Reid, D-Nev., has promised not to bring it up for consideration in the Senate.

"'Plan B' ... is a multi-day exercise in futility at a time when we do not have the luxury of exercises in futility," said White House spokesman Jay Carney Thursday.

Democrats complained that the posturing on "plan B" distracted the focus from a broader bargain on taxes, spending, entitlement reforms and other measures that had begun coming into focus earlier this week.

Reid said the Senate would break for the Christmas holiday but return to Washington one week from Thursday. President Obama will not join his family in Hawaii on Friday as planned if the "cliff" is not resolved, an administration official said.

"If you look at Speaker Boehner's proposal and you look at my proposal, they're actually pretty close," Obama said Wednesday, appealing for a big "fair deal."

"It is a deal that can get done," he said. "But it cannot be done if every side wants 100 percent. And part of what voters were looking for is some compromise up here."

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Human hands evolved so we could punch each other

Forget toolmaking, think fisticuffs. Did evolution shape our hands not for dexterity but to form fists so we could punch other people? That idea emerges from a new study, although it runs counter to conventional wisdom.

About the same time as we stopped hanging from trees and started walking upright, our hands become short and square, with opposable thumbs. These anatomical changes are thought to have evolved for tool manipulation, but David Carrier at the University of Utah in Salt Lake City has an alternative explanation.

He says there are several possible hand shapes that would have allowed greater dexterity, making it less clear why we ended up with the hands we have. But only one hand shape lets us make a fist with a thumb as buttress.

Among primates' hands, ours is unique for its ability to form a fist with the thumb outside the fingers. The fingers of other primates' hands are too long to curl into their palms, and their thumbs are too short to reach across the fingers. So when apes fight, they are far more likely to wrestle or hold their opponent down while others stomp on him, says Carrier.

To test the importance of fists, Carrier and his colleagues recruited 10 athletes and measured how hard they could hit a punching bag using a normal fist, a fist with the thumb stuck out, and with an open palm.

The athletes could generate more than twice the force with a normal fist as with the thumb-stuck-out fist, because of thumb's buttressing role. There was no difference in the force they could generate with a normal fist and with an open palm, but Carrier says it's possible that a fist concentrates the force into a smaller area and so does more damage.

Cause or effect?

Mary Marzke of Arizona State University in Tempe says the study is interesting, but it far from proves that the ability to make a strong fist was the main driver behind the evolution of our hands' shape. It is more likely that it was a useful side effect of a whole suite of modifications.

She points out that apes strike with the heel of their hand when knocking fruit out of trees. Carrier's study didn't assess the force that the heel of the hand generates, but if it turns out to be as good as a fist, it becomes less clear that our hands evolved so as to be perfect for fist-making, Marzke says.

But if the hypothesis is true, Carrier thinks it could explain another mystery. It has long been unclear why high levels of testosterone cause men's ring fingers to be longer than their index fingers. He says the finger-length ratio makes sense if it generates a better fist. This would make dominant males even better fighters.

Journal reference: Journal of Experimental Biology, doi:10.1242/jeb.075713

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.

All comments should respect the New Scientist House Rules. If you think a particular comment breaks these rules then please use the "Report" link in that comment to report it to us.

If you are having a technical problem posting a comment, please contact technical support.

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