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

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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

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Baseball: Ichiro Suzuki inks new 2-year deal with NY Yankees

NEW YORK: Ichiro Suzuki signed a two-year contract with the New York Yankees, giving the Japanese outfielder a chance to crack 3,000 career Major League Baseball hits while wearing Yankee pinstripes.

The deal, worth a reported $13 million, allows the Yankees to keep a 39-year-old standout who has been a 10-time All-Star in 12 seasons since coming from Japan. He was obtained by the Yankees from the Seattle Mariners last July.

"The Yankees are the kind of team that I always envisioned being a part of," Suzuki said on Wednesday. "Everyone in the world of competition has a strong desire to win, but the Yankees also have an atmosphere where losing is not an option.

"These two observations may sound similar, but I believe it is a rarity to find both co-existing in the same organization."

"I believe the Yankees organization appreciates that there is a difference between a 39-year-old who has played relying only on talent, and a 39-year-old who has prepared, practiced, and thought thoroughly through many experiences for their craft.

"I am very thankful and I will do my best to deliver on their expectations."

Suzuki hit .322 with five home runs and 27 runs batted in over 67 games for New York last season and overall batted .283 with 77 runs scored, 28 doubles, six triples, nine homers, 55 runs batted in and 29 stolen bases in 162 games.

By recording base hits in his first 12 games with the Yankees, Suzuki matched a team record for the longest hit streak to begin a Yankees career with Don Slaught's 1988 effort.

Suzuki, who is expected to replace free agent Nick Swisher as the Yankees' starting right-fielder, has 2,606 hits in his North American career, giving him a chance to reach the 3,000 milestone with the Yankees.

Since leaving Japan after a nine-year career in the Pacific League with three Most Valuable Player awards, Suzuki has batted .322 in Major League Baseball with two batting titles.

He was the 2001 American League Most Valuable Player and Rookie of the Year with the Mariners.

- AFP/al

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Twitter shuffles top execs, names new COO and CFO

Twitter CEO Dick Costolo confirmed via tweet today that the massive social network is now being headed by a new chief operating officer and chief financial officer.

Ali Rowghani moves into the COO position from his previous post of CFO at Twitter. Rowghani has been with the social network since 2010, when he joined the company after serving as CFO for the Disney-owned Pixar Animation Studios. According to AllThingsD, Rowghani is known for multi-tasking at the social network and contributing to Twitter's Promoted Suite of ad products.
Mike Gupta moved into Rowghani's former position after working as the treasurer for Zynga. According to AllThingsD, Gupta was at Zynga for about a year and beforehand worked as a high-level executive at Yahoo where he worked on online partnership deals with Microsoft.

It will be interesting to see what these two will do in coming up with ideas to create more revenue for Twitter.

In the past few months, the social network has been pushing hard on structural changes in hopes that it will boost profitability. In September, it announced a new mobile-first strategy aimed at settling on more user experience consistency across its many clients -- Web, iPhone, iPad, and
Android -- a move that it clearly hopes will help increase advertising revenue.

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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."

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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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Temasek raises stake in Olam

SINGAPORE: Temasek Holdings has raised its stake in commodity trader Olam International to 17 percent from 16.3 percent.

In a filing with the Singapore Exchange, Olam said Temasek had bought 200,000 shares for S$293,000 from the open market on Tuesday through its investment vehicle Aranda Investments.

In an emailed comment to Channel NewsAsia, a Temasek spokesperson said: "We have invested in Olam over several years. In our judgement, the company represents a reasonably attractive investment over the long term and we are pleased to have the opportunity to add to our stake."

Earlier this month, Olam said Temasek is backing its rights issue of bonds and warrants to raise as much as US$1.2 billion.

This could potentially translate to the investment firm owning as much as 29 percent of Olam if it exercises all the warrants in 2016 at the earliest.

Kewalram Chanrai Group, Olam's largest investor with nearly a 20 percent stake, has also said it will back the issue.

Olam has been the target of short-seller Carson Block and his research firm Muddy Waters, which questioned the company's allegedly flawed accounting standards that they claimed masked its debts.

- CNA/al

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National Geographic turns off Instagram over new terms

The backlash over announced changes to Instagram's terms of service has led National Geographic to suspend its posting activity on the photo sharing app.

The Facebook-owned app ignited a storm of protest with the announcement earlier this week that it had perpetual right to sell users' photographs without payment or notification. Under the new policy, Facebook claimed the perpetual right to license all public Instagram photos to companies or any other organization, including for advertising purposes, effectively transforming the Web site into the world's largest stock photo agency.

National Geographic, a magazine long respected for presenting high-quality photographs that are both artistic and journalistic, made the announcement today on its Instagram account. "We are very concerned with the direction of the proposed new terms service and if they remain as presented we may close our account," the post reads.

Recent comments by Instagram suggest such action may not be necessary. The app maker apologized to its users today, saying it will "remove" language from its legal terms that would have let it sell users' photos or use them in advertisements.

In a blog post this afternoon, Chief Executive Kevin Systrom said it's "our mistake that this language is confusing" and that the company is "working on updated language."

"Since making these changes, we've heard loud and clear that many users are confused and upset about what the changes mean," he wrote.

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