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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Police Chief Wants to Ban High-Capacity Firepower

High-capacity magazines are the deadliest of gun cartridges. They come in cases of 30, 40, 60 and even 120 rounds.

These magazines are maximum, economy-sized firepower packed into a steel cartridge. When strapped into a pistol or semi-automatic rifle, a shooter can fire non-stop until the magazine is empty. By then, the damage can be devastating.

That is why the Baltimore County Police Chief Jim Johnson wants to outlaw all but the smallest of these magazines. Johnson wants to limit them to a capacity of 10 rounds.

The fewer the bullets, the more often the shooter has to stop firing, eject the empty cartridge and load another one.

A lot can happen in the window of time it takes to reload, Johnson said.

"Folks that are being attacked have time to react, to close that distance in," he said. "I think any football player in America would like to have four-and-a-half seconds to get to the quarterback without any of the offensive players."

An expert shooter like a police officer can switch magazines in less than two seconds. But for a nervous, scared adolescent, it would take much longer, Johnson said, which can be crucial.

During the Tucson, Ariz., attack on Rep. Gabby Giffords, gunman Jared Loughner was wrestled down when he stopped shooting to reload his 9-millimeter pistol.

During the Aurora, Colo., movie theater shooting spree last July, police say James Holmes' assault came to an end when his semi-automatic rifle jammed.

"As we've seen in America today, there have been several attacks where that reload is vital," Johnson said. "Tragically, in the shooting of a congresswoman, the reload was instrumental.

"We've also seen this in Baltimore County, in a school shooting that we had, where the reload became very instrumental in allowing the teacher to actually tackle a student that was trying to reload a double-barreled shotgun," he said.

Last week at Sandy Hook Elementary School in Newtown, Conn., police believe Adam Lanza was armed with high-capacity magazines. He fired at least 30 times before having to stop to reload.

Johnson said there is no reason that the general public should have access to high-capacity magazines.

"I have to advise you that even for law enforcement, 100-round magazines, 50-round magazines, have no place for law enforcement," Johnson said. "Certainly, we believe that limiting a magazine to 10 rounds, what was in place from '94 to 2004, is wise and certainly could save lives in America."

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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

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Review slams BBC over Savile report but says no cover-up

LONDON: An official report strongly criticised the BBC's handling of allegations of child sex abuse against late presenter Jimmy Savile, but cleared the world's biggest broadcaster of a cover-up.

The findings by an independent inquiry sparked the resignation of the BBC's deputy director of news, and led to the editor and deputy editor of the programme at the centre of the scandal being replaced.

The report exposed the "chaos and confusion" at the BBC although it dismissed claims that its flagship current affairs programme Newsnight dropped an investigation into Savile so as not to jeopardise Christmas tribute shows to him.

The BBC commissioned the inquiry by former Sky News executive Nick Pollard in October during a major crisis at the corporation that cost then-director-general George Entwistle his job.

Savile, who died last year at the age of 84, was one of the BBC's top TV and radio presenters.

The child abuse claims were first made public by rival broadcaster ITV two months ago and since then police have identified 199 crimes in which Savile is a suspect, including 31 alleged rapes.

Newsnight first had evidence of the allegations a year ago, shortly after Savile's death, but it dropped the story after just a few weeks.

The Pollard report found no evidence to support claims that this was to avoid an embarrassing clash with planned Christmas tributes to the late star.

But it criticised the decision to drop the probe and the BBC's failure to deal with the ensuing crisis at the broadcaster, which it said was plagued by infighting and a "critical lack of leadership and coordination".

"The decision to drop the original investigation was flawed and the way it was taken was wrong but I believe it was done in good faith. It was not done to protect the Savile tribute programmes or for any improper reason," Pollard said.

"In my view, the most worrying aspect of the Jimmy Savile story for the BBC was not the decision to drop the story itself. It was the complete inability to deal with the events that followed."

BBC Trust chairman Chris Patten, the former governor of Hong Kong, said the BBC accepted the review in its "entirety" and looked at the failings of the corporation with "pretty searing honesty".

In an email to staff, acting director-general Tim Davie welcomed the finding that there was no cover-up but acknowledged the report had exposed "clear failings" which must now be addressed.

He announced a shake-up of staff at Newsnight, saying the programme's editor, Peter Rippon, and deputy editor, Liz Gibbons, would move to other BBC jobs.

And he said Stephen Mitchell was resigning as deputy director of BBC news and would leave next year after 38 years with the corporation.

Mitchell had stood aside pending the Pollard review, and was criticised in Wednesday's report for removing Newsnight's Savile investigation from an internal BBC list that flagged up controversial stories.

Mitchell's boss, director of news Helen Boaden, keeps her job despite being criticised for failing to take greater responsibility as the crisis grew.

Davie later told Newsnight that it had been a "particularly bad and sorry saga" but defended the lack of sackings.

"My job is not to just dismiss people, my job is to make a fair and balanced assessment of the facts," he said.

"The idea that you have to sack someone to lead to cultural change I think is just flawed."

The report also revealed that when Savile was ill a BBC executive had emailed Entwistle before he became director general to urge against preparing an obituary for the late presenter because of concerns about "the darker side" of his life.

Entwistle said he never read that email and Pollard said he found nothing to suggest anyone preparing the tribute programmes was aware of the rumours or allegations about Savile.

London police on Wednesday arrested an eighth person in connection with the Savile abuse probe, who was identified by media as the star's former producer.

The scandal over Newsnight's dropped investigation was compounded when the programme broadcast a television report last month which wrongly implicated a senior former Conservative politician, Alistair McAlpine, in child sex abuse.

The BBC was forced to apologise and pay substantial damages to McAlpine, and Entwistle resigned as director-general after only 54 days in the job.

He will be replaced by former BBC news chief and current Royal Opera House chief Tony Hall in March.

A further investigation is ongoing into what the BBC knew about Savile's activities during his time there.

- AFP/al

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Redbox Instant launches private beta for video streaming

Redbox Instant -- Verizon's stab at a video-streaming service to compete with Netflix -- was rolled out into private beta today. For the first time, users can sign up for the service and see what it has to offer.

The service will give new users, who sign up to try it in beta, unlimited streaming and four DVD credits for free for one month, according to the Web site. Once the month-long trial ends, the service will cost $8 per month.

Redbox Instant is a joint venture announced in February between Verizon and Coinstar -- the company that owns the Redbox DVD rental business. The companies have been working on developing an on-demand video-streaming service with DVD rentals. Redbox Instant will also supposedly be available on a variety of operating systems and devices, such as
Android, iOS,
Xbox 360, some Samsung TVs, and Blu-ray players.

Earlier this month, rumors leaked that the service would be fully available by the end of the year. However, it was actually the private beta that became available. The new date for the public launch of Redbox Instant is now scheduled for the end of 2013's first quarter or the beginning of the second quarter.

The service is undercutting key rival Netflix's monthly rates by charging just $6 a month for unlimited streaming -- $2 less than Netflix's comparable offer. If users want the four-DVD plan also, it costs $8 a month. A plan that includes Blu-Ray discs costs $9 a month.

While the service is more affordable than Netflix's offering, Redbox Instant won't have the same access to movies and shows. It has an agreement to get content from Epix, as well as studios such as Paramount, Lionsgate, and MGM, but it will still fall short of the breadth of offerings that Netflix boasts.

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Detecting Rabid Bats Before They Bite

A picture is worth a thousand words—or in the case of bats, a rabies diagnosis. A new study reveals that rabid bats have cooler faces compared to uninfected colony-mates. And researchers are hopeful that thermal scans of bat faces could improve rabies surveillance in wild colonies, preventing outbreaks that introduce infections into other animals—including humans.

Bats are a major reservoir for the rabies virus, according to the Centers for Disease Control and Prevention (CDC) in Atlanta. Previous research shows that bats can transmit their strains to other animals, potentially putting people at risk. (Popular Videos: Bats share the screen with creepy co-stars.)

Rabies, typically transmitted in saliva, targets the brain and is almost always fatal in animals and people if left untreated. No current tests detect rabies in live animals—only brain tissue analysis is accurate.

Searching for a way to detect the virus in bats before the animals died, rabies specialist James Ellison and his colleagues at the CDC turned to a captive colony of big brown bats (Eptesicus fuscus). Previous studies had found temperature increases in the noses of rabid raccoons, so the team expected to see similar results with bats.

Researchers established normal temperature ranges for E. fuscus—the bat species most commonly sent for rabies testing—then injected 24 individuals with the virus. The 21-day study monitored facial temperatures with infrared cameras, and 13 of the 21 bats that developed rabies showed temperature drops of more than 4ºC.

"I was surprised to find the bats' faces were cooler because rabies causes inflammation—and that creates heat," said Ellison. "No one has done this before with bats," he added, and so researchers aren't sure what's causing the temperature changes they've discovered in the mammals. (Related: "Bats Have Superfast Muscles—A Mammal First.")

Although thermal scans didn't catch every instance of rabies in the colony, this method may be a way to detect the virus in bats before symptoms appear. The team plans to fine-tune their measurements of facial temperatures, and then Ellison hopes to try surveillance in the field.

This study was published online November 9 in Zoonoses and Public Health.

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Obama Invokes Newtown on 'Cliff' Deal

Invoking the somber aftermath of the school massacre in Newtown, Conn., President Obama today appealed to congressional Republicans to embrace a standing "fair deal" on taxes and spending that would avert the fiscal cliff in 13 days.

"If there's one thing we should have after this week, it should be a sense of perspective about what's important," Obama said at a midday news conference.

"I would like to think that members of that [Republican] caucus would say to themselves, 'You know what? We disagree with the president on a whole bunch of things,'" he said. "'But right now what the country needs is for us to compromise.'"

House Speaker John Boehner's response: "Get serious."

Boehner announced at a 52-second news conference that the House will vote Thursday to approve a "plan B" to a broad White House deal -- and authorize simply extending current tax rates for people earning less than $1 million a year and little more.

"Then, the president will have a decision to make," the Ohio Republican said. "He can call on Senate Democrats to pass that bill or he could be responsible for the largest tax increase in American history."

Fiscal Cliff Negotiations: Trying to Make a Deal Watch Video

House Speaker John Boehner Proposes 'Plan B' on Taxes Watch Video

'Fiscal Cliff' Negotiations: Deal Might Be Within Reach Watch Video

Unless Congress acts by Dec. 31, every American will face higher income tax rates and government programs will get hit with deep automatic cuts starting in 2013.

Obama and Boehner have been inching closer to a deal on tax hikes and spending cuts to help reduce the deficit. But they have not yet had a breakthrough on a deal.

Obama's latest plan would raise $1.2 trillion in new tax revenue over 10 years, largely through higher tax rates on incomes above $400,000. He also proposes roughly $930 billion in spending cuts, including new limits on entitlement spending, such as slower annual cost-of-living increases for Social Security beneficiaries.

Boehner has agreed to $1 trillion in new tax revenue, with a tax rate hike for households earning over $1 million. He is seeking more than $1 trillion in spending cuts, with significant changes to Medicare and Social Security.

The president said today that he remains "optimistic" about reaching a broad compromise by Christmas because both sides are "pretty close," a sentiment that has been publicly shared by Boehner.

But the speaker's backup plan has, at least temporarily, stymied talks, with no reported contact between the sides since Monday.

"The speaker should return to the negotiating table with the president because if he does I firmly believe we can have an agreement before Christmas," said Sen. Chuck Schumer, D-N.Y., a White House ally.

Schumer said Obama and Boehner are "not that far apart" in the negotiations.

"If they were to come to an agreement by Friday, they could write this stuff over the Christmas break and then we'd have to come back before the New Year and pass it," Schumer said.

Obama said he is "open to conversations" and planned to reach out to congressional leaders over the next few days to try to nudge Republicans to accept a "fair deal."

"At some point, there's got to be, I think, a recognition on the part of my Republican friends that -- you know, take the deal," he told reporters.

"They keep on finding ways to say no, as opposed to finding ways to say yes," Obama added. "At some point, you know, they've got take me out of it and think about their voters and think about what's best for the country."

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Today on New Scientist: 18 December 2012

Violent polar storms help control the world's weather

Without the mini-hurricanes which form over the Arctic, the world could face massive weather disruption

Ancient city of Troy rebranded itself after war

Changing styles of pottery 3200 years ago show the Trojans were quick to align themselves with the region's new political power

Court ruling will clarify end-of-life decisions

Canada's supreme court will soon rule on whether doctors can stop treatment for "unconscious" patients, but determining awareness remains a thorny issue

Colourful claw of tiny ocean predator

See a prizewinning photo of the claw of a Phronima: a tiny marine predator whose size belies its ferocity

Gaming chair mimics a full-motion simulator

If you can't afford a full-motion flight or car simulator, here's a cheap way of creating some of the same effects

How an ancient Egyptian code unmasked a cannibal star

Has a papyrus from the time of the pharaohs exposed the ghoulish habits of the baleful Demon Star? Stephen Battersby investigates

Best videos of 2012: Bonobo genius makes stone tools

Watch a creative bonobo fashion tools to retrieve hidden food, at number 9 in our countdown of the year's best videos

Is the obesity epidemic caused by too much sugar?

In Fat Chance, endocrinologist Robert Lustig argues that insidious changes to our eating habits have caused disruptions to our endocrine systems

'The idea we live in a simulation isn't science fiction'

If the universe is just a Matrix-like simulation, how could we ever know? Physicist Silas Beane thinks he has the answer

Fungal frog killer hops into crayfish

Crayfish are vulnerable to the same chytrid fungus already killing frogs all over the world. The discovery provides a clue to how the disease spreads

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AU Optronics executive guilty in LCD price-fixing case

SAN FRANCISCO: A US jury on Tuesday found a former senior manager at Taiwan-based AU Optronics Corp guilty of taking part in a global scheme to rig prices of liquid crystal display screens.

Shiu Lung Leung faces a maximum sentence of 10 years in prison and a $1 million fine for his crime, according to the US Department of Justice.

Marketplace rivals fixed the prices of LCD panels during monthly meetings held secretly at hotel conference rooms, karaoke bars and tea rooms around Taiwan, according to prosecutors.

A trial in San Francisco ended in March with AUO executives Hsuan Bin Chen and Hui Hsiung convicted for their roles in a conspiracy between late 2001 and late 2006 to rig prices of thin film transistor LCD panels.

A judge fined the company $500 million for taking part in what prosecutors called the "most serious price-fixing" case in US history.

Officials said that the fine matched the largest ever imposed on a company for violating US anti-trust laws.

A mistrial was declared in a portion of the proceedings involving Leung, and the verdict in his case was the outcome of a three-week retrial.

"This international price-fixing conspiracy impacted countless American consumers by raising the price of computer monitors, notebooks and televisions containing LCD panels," said Deputy Assistant Attorney General Scott Hammond.

The global LCD market was valued at $70 billion annually by the end of the alleged conspiracy, and companies that wound up paying inflated prices for screens included Apple, Dell and Hewlett Packard, according to prosecutors.

As a result of the investigation, eight companies have pleaded guilty or been convicted and have been sentenced to pay criminal fines totalling more than $1.39 billion, according to the Department of Justice.

- AFP/al

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House approves Netflix-backed changes to video privacy law

The U.S. House of Representatives passed a Netflix-backed bill today that would make it easier for people to share their video-viewing habits online, while failing to act on an e-mail privacy measure.

By voice vote, members of the House approved H.R. 6671, which amends the Video Privacy Protection Act to allow video rental companies to obtain consent from customers in order to share information about their viewing preferences on social networks. Originally passed in 1988, the law was enacted after a newspaper printed the video rental history of Judge Robert H. Bork during his Supreme Court nomination hearings.

Netflix applauded the bill's passage and voiced optimism for its chances in the Senate, the bill's next destination.

"We are pleased the house has moved to modernize the VPPA, giving consumers more freedom to share with friends when they want," the streaming company said in a statement. "We look forward to swift action in the Senate."

The bill is similar to a proposal approved last month by the Senate Judiciary Committee, minus language inserted by Sen. Patrick Leahy requiring police to obtain search warrants before accessing files stored in the cloud, including e-mail.

The House amendment to the act requires approval of the Senate Judiciary Committee, which is unlikely to happen before the Senate adjourns for the holidays. Leahy, the Vermont Democrat who heads the Judiciary committee, in September postponed discussion on the proposal.

Civil liberties advocates criticized the House for not acting on the e-mail warrant requirement.

"Changes to electronic privacy cannot happen piecemeal," Chris Calabrese, legislative counsel for the American Civil Liberties Union, said in a statement. "If we are to achieve true reform -- which means getting full protection for Americans' in-boxes and private communication -- we cannot give priority to special interests."

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