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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Man loses S$6,000 in unhonoured online purchase

SINGAPORE: 21-year-old Kenrick Ho is S$6,000 poorer after an online purchase gone wrong.

He had ordered 10 mobile phone sets from an eBay seller named Ms Siah, in September 2012.

But after making full payment, no goods were delivered.

"(I am) very depressed and stressed because I can do alot with S$6,000," he lamented. "What if I need the money urgently? The seller said she'd refund the money, but she kept delaying it."

Like Mr Ho, 46-year-old Madam Teo Kim Sang ordered three mobile phone sets and paid Ms Siah S$1,500 in October.

After much hassle, Madam Teo managed to get a refund of S$750, two weeks after she made full payment.

She said: "If today is Saturday, she'll say '(On) Friday I'll update you, whether I get the phone, whether I deliver, all these things' and sometimes she'll say '(On) Friday I'll deliver (the phones)' but when Friday comes, nothing (arrives)."

The relief teacher has since cancelled her order.

Both Mr Ho and Madam Teo said they will lodge a report with the Small Claims Tribunal next week.

Separately, calls from Channel NewsAsia to Ms Siah went unanswered.

According to the Consumers Association of Singapore (CASE), there were 228 reports of "failure-to-honour" transactions between January and November this year.

Of these, CASE handled and assisted 48 of the reports. Of those that CASE handled, about half were resolved.

Experts say it is more difficult for buyers to recover their money as there is no physical shopfront.

"The practices of the online vendors or online businesses are covered by the Consumers Protection Fair Trading Act and consumers can exercise their right under the Act to file a claim at the Small Claims Tribunal," said Seah Seng Choon, executive director of CASE.

"Secondly, if the consumer suspects foul play or cheating in any way, they should file a complaint with the police. They should ensure that the business is set up in Singapore. For businesses that are set up overseas, consumer would have great difficulty seeking redress if there's any dispute later on."

With more people going online to make their purchases, Mr Seah said it is important to read the terms and conditions of the transaction so as to avoid pitfalls of online shopping.

He added that shoppers who purchase items online has the right under the lemon law to request the businesses to repair, refund or even reduce prices if there are defects on the goods.

Another way to avoid problems in transactions is to go for cash-on-delivery deals.

- CNA/xq

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Browsers: Top 5 events from 2012

For a while there, the browser was winning the war.

New startups launched online services rather than packaged software. Browser makers raced to transform the Web from a place to publish documents into a general-purpose programming platform. People spent more and more time using the Web instead of software that ran natively on devices.

Then the era of modern smartphones and
tablets began. And in 2012, it became clear that Web app advocates will have to work a lot harder to build a universal software foundation. Here's a look at what happened this year in the world of the Web, starting with an an extremely public vote of no confidence.

The W3C's new HTML5 logo stands for more than just the HTML5 standard.

(Credit:
W3C)

Facebook slaps down HTML5
The basic technology for describing Web pages is Hypertext Markup Language, and the new HTML5 version now symbolizes modern Web development, even though it also relies on other standards such as JavaScript for running actual programs and CSS for formatting and effects.

The HTML5 idea is that Web apps can span many devices -- Windows machines, Macs, smartphones, tablets, and more -- because everything has a browser these days. One of the biggest advocates of the approach was Facebook, which used Web coding to reach a tremendous range of devices.

But Facebook this year abruptly changed course, choosing instead to release native iOS and
Android apps. The company had loved the Web approach, which let its programmers constantly release new versions that would load the same way a browser loads a fresh version of a Web site. But the performance wasn't acceptable.

"I think the biggest mistake that we made as a company is betting too much on HTML5 as opposed to native," Chief Executive Mark Zuckerberg said. "Probably we will look back saying that is one of the biggest mistakes if not the biggest strategic mistake that we made."

Zuckerberg's long-term enthusiasm for Web apps was a pretty unappealing consolation prize.

Facebook founder and CEO Mark Zuckerberg called his company's reliance on Web apps for mobile access to the site a major strategic error.

(Credit:
James Martin/CNET)

Microsoft stiffs browser rivals
With
Windows 8, Microsoft is trying to make a fresh start with the operating system interfaces that software can use. Windows 8 marries the older Win32 interfaces with the new WinRT. But Windows RT, the cousin that runs on mobile devices such as Microsoft's Surface that use ARM processors, lets third-party software use only the WinRT interfaces.

That happens to hobble browsers -- well, third-party browsers like Chrome and Firefox. Microsoft's own IE10 gets access to the low-level Win32 interfaces, letting it run JavaScript faster. Mozilla objected strenuously, and Google piled on, too. Microsoft carved an exception for browsers running on Windows 8, no doubt encouraged by its earlier antitrust woes involving Internet Explorer, but the company doesn't look likely to budge on Windows RT.

Even though European officials are checking into the situation, legal experts think any opponents would have a hard antitrust case.

The result, though could be that browser choice becomes a thing of the past. Safari dominates on iOS, Android's browser on Android, and IE on Windows Phone. Even if people might want a choice, company limits often preclude it.

Do Not Track derailed
Microsoft also threw a wrench in the works of a proposed new standard called Do Not Track (DNT) that's designed to let people tell Web sites not to keep tabs on their online behavior. The effort grew out of a Federal Trade Commission request for the industry to come up with a voluntary solution to the issue, since privacy advocates are not happy with the idea of behavioral targeting of advertisements.

Mozilla proposed a solution that got traction in Chrome, Opera, and Safari, in which browsers would tell Web sites not to track if people had expressly set the browser to send the message. But Microsoft, saying it wanted more privacy, turns DNT on if people accept the Windows 8 default installation settings. That might sound great for privacy, but online advertisers say they'll ignore the setting if it hasn't been expressly set by users.

DNT author Roy Fielding, an Adobe scientist and programmer in the Apache Web server software project, one-upped Microsoft by patching Apache so it overrides IE's DNT setting. But Microsoft isn't budging.

What could break the DNT gridlock? Perhaps the appointment of Peter Swire as co-chair of the group trying to standardize it.

Microsoft's IE has stopped its market-share losses, with Chrome and Firefox jockeying for second place.

(Credit:
Data from Net Applications; chart by Stephen Shankland/CNET)

IE gets real
There's a big community of people who don't like Microsoft's browser actions -- squashing Netscape in the 1990s then letting IE6 lie fallow for years.

But that's old thinking. Microsoft dragged itself back aboard the Web standards bandwagon with IE9. But this year's release of IE10 -- packaged with Windows 8 and set to arrive in finished form later for Windows 7 -- that's the stronger statement.

IE10 supports a long list of new Web standards: IndexedDB and AppCache for writing Web apps that work even when a computer doesn't have a Net connection; support for a range of pointers including multitouch interfaces; asychronous script execution for getting Web pages to load faster and run more smoothly; the file interface for better uploads and ways for apps to access data; sandbox security restrictions; and a lot of Cascading Style Sheets (CSS) effects.

And it's pretty fast to load Web pages. All this means IE10 can compete -- and not just because it's built into Windows. There are still some missing features -- the WebGL interface for 3D graphics, for instance, which Microsoft thinks is a security risk -- but even without it and some other omissions, Web programmers still can look forward to IE's transition to a modern browser.

Naturally, Microsoft is tooting its IE horn as a result. And it has a strong incentive to keep pushing ahead: Windows 8 apps can be written using the JavaScript, CSS, and HTML Web technologies. Microsoft might have a vanishingly small share of Web usage in the mobile market, but it has mostly stopped IE's share losses in PC browser usage.

The $249 Samsung Chromebook

(Credit:
Sarah Tew/CNET)

Price cut makes Chromebooks worthwhile
Chrome OS, Google's browser-based operating system, was a wacky idea when it debuted in 2009 and still not very compelling when it arrived in products called Chromebooks in 2011. But in 2012, Google and its Chrome OS allies came up with a much more compelling recipe by lowering the price.

First came the $249 Samsung Chromebook, which uses an ARM processor rather than a more conventional Intel chip. Next was the even cheaper Acer C7 Chromebook, which uses an Intel chip but drops the SSD in favor of a conventional hard drive.

Neither can come anywhere close to replacing a video-game rig or Photoshop workstation. But for the price, they can be a capable second or third machine to have around the house for e-mail, surfing, Facebook, and homework assignments. They may not have the entertainment appeal of a tablet packed with games, but they're cheaper than a new iPad, and a lot of people prefer a keyboard when it's time to type.

Samsung also released some higher-end Chromebooks and the first Chromebox, a small machine that requires an external monitor, keyboard, and mouse. They're more expensive, but in combination with the significantly revamped Chrome OS and integrated with Google Drive, they're useful for a certain population.

Web apps may be struggling on smartphones and tablets, but for a laptop, they're a more realistic option. Browser makers and Web developers have work to do on mobile, but they're hardly an endangered species.

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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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'Cliff' Deniers Put Faith in No Deal

Not everyone thinks the "fiscal cliff" is so bad.

If the Dec. 31 deadline passes, income taxes will go up and across-the-board spending cuts will hit government programs. But while most of the political world frets as if a major disaster is looming, others have treated it more like the Y2K bug: a fiscal canard ginning up a lot of unnecessary panic.

The cliff is a "fantasy," former House speaker Newt Gingrich told a sold-out crowd at the Ronald Reagan library in Simi Valley, Calif., a week before Election Day.

"It is an excuse to panic," Gingrich said. "It is a device to get all of us running down the road so we accept whatever Obama wants, because otherwise we will have failed the fiscal cliff, and how can you be a patriot if you don't do what the fiscal cliff requires?"

Fiscal Cliff 'Plan B' Is Dead: Now What?

The former speaker wanted Republicans to stop negotiating with President Obama, for fear of giving too much away. "Back out of all of this negotiating with Obama," Gingrich publicly advised House Republicans. "The president is overwhelmingly dominant in the news media" but, at the opposite end of the political spectrum, liberals have said the same thing for a similar reason.

Kevork Djansezian/Getty Images

Fiscal Cliff: Boehner Doesn't Have Votes for Plan B Watch Video

'Fiscal Cliff' Negotiations: Boehner's Plan B Watch Video

While the "cliff" would mean higher taxes on the middle class, it would also mean higher taxes on the wealthy, a chief demand for liberals. Automatic budget cuts would hit defense programs, which liberals have wanted to cut anyway, but not the Medicare and Social Security entitlements that Democrats and progressives want so badly to protect.

Boehner Pulls 'Plan B' Amid GOP Disarray

Van Jones, the environmental activist and resigned White House green jobs "czar," sought to quiet the "fiscal cliff" alarms Election Night on CNN. "The problem with the label 'the cliff' is that it creates a mindset that there is nothing worse that this set of cuts, and there are things that are worse," Jones said.

"We cannot be in a situation where we get bullied or stampeded into putting in a deal that's even worse than what the fiscal cliff is about."

Jones later wrote on his blog that the "fiscal cliff" is actually a "fiscal bluff": "The so-called fiscal cliff is actually a fiscal bluff --- a made-up crisis to make us think our government is out of money and time. Congress continues to drag its feet over raising taxes on the wealthiest Americans, despite the top 1% earning 23% of the nation's income, and insists on calling for cuts to vital programs instead of reining in massive subsidies ($100 billion in 2011 alone) to major corporations that already make billions in profits.

"America isn't broke --- it's being robbed.
Gingrich and Jones started the conversation, but as the deadline creeps closer, others are finishing it."

To some, the "fiscal cliff" offers a clearer upside.

"Democratic and progressive leverage goes immensely up if we get past the beginning of the year," Adam Green of the Progressive Change Campaign Committee told ABC News. "Once they have to proactively lower taxes on the rich, it makes it harder and harder to move that number up and makes it easier and easier to force votes or demand votes on policies that clearly benefit the middle class."

Green says liberals will get what they want immediately, if the Dec. 31 deadline passes without a deal.

"We really want to get past the first of the year so that we have that leverage in the bag," Green told ABC. "It will also show that the fiscal cliff was a mess. If we get into 2013, the really good stuff happens right away, and the really big cuts are a 10-year phasing."

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Best videos of 2012: First motion MRI of unborn twins

Joanna Carver, reporter

These twins imaged in the womb are ranked at number 6 in our best videos of 2012 countdown.

If you want to get a sense of what it might be like to share a womb with a sibling, this video may give you a glimpse. For the first time, unborn twins have been captured using cinematic MRI, a technique that images slices of the body several times to create a video with astonishing detail.

According to Marisa Taylor-Clarke of Imperial College London, who recorded the images, this is "raw" footage, unlike typical videos of the womb, which require computer processing afterwards. She uses the technique to study twin-to-twin transfusion syndrome, a potentially fatal condition where one twin's growth is stunted when its sibling receives more of the blood supply.

For more about the video check out the original article, "Unborn twins caught on video MRI for the first time". If you enjoyed this post, see the first video of a couple having sex in an MRI scanner.

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Venture Scouts, Girl Guides conferred prestigious awards

SINGAPORE: Eighteen Venture Scouts and seven Girl Guides in Singapore have been conferred the highest honour in the movement.

President Tony Tan Keng Yam presented the President's Scout Award and the President's Guide Award for 2012 at the Istana on Friday.

The awards are the highest honour given to Singapore's most all-rounded Venture Scouts and Girl Guides.

The awards come as recognition of the recipients' excellent performance, dedication to the movement, and service to the community.

- CNA/ck

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Facebook's $1 messages: one more way to get your credit card

Facebook, which began the year with a reputation for caring more about its users than about making a buck, is ending the year with the rollout of yet another way to try to squeeze more money from its members.

This latest money-making effort comes with a revamp of its popular Messages service -- that part of Facebook through which you can message/e-mail your "friends" and, in fact, those who aren't your friends. What's changing -- and a spokesman describes it to CNET as a "small experiment" -- is that Facebook will start charging some people for messages they want to send to people they're not friends with.

The $1 cost seems steep just to shoot someone a message, but no matter. Facebook will surely drop the price if no one uses it. But the bigger point: This latest "test" shows that Facebook, eager to prove to Wall Street that it's building a cash-generating empire, is looking for more ways to add revenue streams not tied to advertising and, importantly, is trying to get more user credit cards on file.

Unlike some other titans of consumer tech -- namely, Apple and Amazon -- Facebook has a vast wealth of data about all of us but relatively few credit cards. Most of the credit card numbers it has -- a number it won't disclose -- it's accumulated from people who play games and pay up for virtual items. But that's far from enough for Facebook's ambitions.

The company has recently added other features that require credit card, and so far Facebook has given no indication for how those are going. In October, for instance, it started letting people pay $7 to promote a post. And earlier this month, it opened up Facebook Gifts to all U.S. users and added a range of new retail partners so that users can send friends everything from wine to clothes from BabyGap -- provided, of course, they enter a credit card. Anyone who's tried it might notice that Facebook doesn't take PayPal. Then, the next time you decide to buy a gift, your information card information pops up and is ready to go.

This is the way Facebook wants it, particularly if it rolls outs more services and offers that people can pay for through their phones. The more credit cards Facebook has on file, the more likely mobile users will send gifts or whatever else Facebook has in store as part of its business plan.

Facebook's messaging effort hardly seems like a slam dunk. To be fair, Facebook seems to be tip toeing into this, probably aware that some people might get annoyed if strangers are suddenly blasting them with messages. The pay-to-message experiment comes as part broader changes to Facebook's messaging system, which today is rolling out to every user worldwide. It's all a bit confusing in that Facebook sort of way.

Before these changes, users could send messages to strangers unless those people set restricted privacy settings, something Facebook says most people don't do. Under the new system, users can message anyone regardless of their privacy settings; the messages end up in a folder labeled "other," which is designed to catch spam. That's where the money comes in. To bypass the recipients "other" folder, users can pay $1 to make sure their messages end up in a person's main inbox. (This is not currently available for Pages, only individual Facebook members).

There is no way to opt out of this newly updated Messages system. The only way not to get messages from strangers is to block them after the fact. While those who don't want to message strangers may find the $1 messaging service odd, there are others who may find the option handy.

Facebook argues it would be useful if you were, for example, planning a surprise party for a friend through Facebook. Four of the five people you are inviting to this party are friends with you as well, but one is not. You could make sure the fifth person gets the invite in their Inbox, instead of the "other" folder, by paying the $1. Additionally, there are people -- recruiters, job seekers, public relations folks or (ahem) journalists -- who use Facebook to network.

Facebook won't say how many people use the messaging now or how many people send messages to users who aren't their friends, but even if a small portion of Facebook's billion-plus members decide this is a worthwhile tool, there's plenty of potential -- both for cash and credit.

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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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NRA to Speak on Stopping Newtown Repeat

For the past week, leadership at the National Rifle Association has largely stayed away from the media, but this morning the group may weigh in on how to keep a deadly shooting massacre like last week's at a Newtown, Conn., elementary school from happening again.

The NRA will hold a news conference in Washington, D.C., just before 11 a.m.

Its leadership has held off on interviews this week after refusing to appear on Sunday morning public affairs shows this past weekend.

The group came under pressure after Adam Lanza, 20, killed 20 children and six adults before shooting himself at Sandy Hook Elementary School in Newtown last Friday.

"Out of respect for the families, and as a matter of common decency, we have given time for mourning, prayer and a full investigation of the facts before commenting," the group said in a press release Tuesday. "The NRA is prepared to offer meaningful contributions to help make sure this never happens again."

NRA News anchor Ginny Simone said Thursday that in the wake of the Sandy Hook shooting, membership surged "with an average of 8,000 new members a day."

New York City Mayor Michael Bloomberg has said the NRA is partially to blame for the tragedy.

"We're not trying to take away your right to advance the interests of gun owners, hunters, people who want to protect themselves," Bloomberg told "Nightline" anchor Cynthia McFadden in an interview Thursday. "But that's not an absolute right to encourage behavior which causes things like Connecticut. In fact, Connecticut is because of some of their actions."

Christian Gooden/St. Louis Post-Dispatch/AP Photo

President Obama Launches Gun-Violence Task Force Watch Video

President Obama on Gun Control: Ready to Act? Watch Video

Joe Biden to Lead Task Force to Prevent Gun Violence Watch Video

The guns used in the attack were legally purchased and owned by the shooter's mother, Nancy Lanza, who Adam Lanza shot to death before his assault on the school.

In the aftermath of the shooting, many, including Bloomberg, have called for stricter regulations on the type of weapons used in this and other instances of mass gun violence this year.

Sen. Dianne Feinstein, D-Calif., has said she intends to introduce a bill banning assault weapons on the first day of next year's Congress -- a step the president said he supports.

President Obama announced Wednesday that Vice President Joe Biden will head a task force of leaders from across the country that will evaluate the best solutions to reduce gun violence in the United States.

Obama said he will "use all the powers of this office to help advance efforts aimed at preventing more tragedies like this."

Mayors Against Illegal Guns, of which Mayor Bloomberg is co-chair, released a letter to President Obama signed by more than 750 mayors calling on him to produce a plan to "make it harder for dangerous people to possess guns."

The letter asked for mandatory background checks for gun buyers, a ban on high-capacity rifles and ammunition magazines, and a designation of gun trafficking as a federal crime.

ABC News' George Stephanopoulos looked at whether strict gun control laws like those that have worked for the United Kingdom and Japan could work for the U.S. on "Good Morning America" Thursday.

Others have argued that, rather than banning guns, the government should be arming teachers and administrators in schools so that they can defend students in the event of another school shooting.

While Michigan Gov. Rick Snyder vetoed a measure that would have let guns into schools on Tuesday, Texas Gov. Rick Perry and Virginia Gov. Bob McDonnell praised the idea.

Speaking on the NRA's daily news program Tuesday, Dave Koppel of the Independence Institute said the teachers at Sandy Hook should have had weapons.

"We'd certainly be talking about fewer innocent people and children dead," Koppel said.

While a national debate over the necessary solutions to prevent a tragedy of this nature from ever happening again wages on, Connecticut residents will have to wait "several months" before the final Connecticut State Police report on the Newtown shootings is complete.

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