BJ_Covert_Action writes "NASA engineers have finally discovered the root cause of the cracks that have been found on space shuttle Discovery's main external tank. The main tank, one of the 'Super Lightweight Tank' models developed by Lockheed-Martin, employs an aluminum-lithium alloy developed by Lockheed-Martin specifically for this application. The new alloy is used in various structural stringers throughout the SLWT design. Unfortunately, the batch of this alloy used in the tank that is currently mated with the Discovery shuttle appears to be of low quality. The alloy used in the stringers has a 'mottled' appearance, compared to the nominal appearance typically used in the main tank stringers (see picture in article). This appearance is indicative of a fracture threshold that is significantly lower than typical. NASA has determined, through testing, that this low grade alloy has only 65% of the fracture strength of the nominal alloy typically used. NASA engineers have devised a potential fix to the problem that they are currently testing to ensure the repair will cause no unintended consequences. NASA plans to have the Discovery shuttle ready to launch again by February 24th, 2011."

techmuse writes "In a veritable Who's Who of Doctor Who, 10th Doctor David Tennant is marrying Georgia Moffett, the daughter of 5th Doctor Peter Davison, who played the Doctor's daughter in an episode of Doctor Who. Except that the Doctor's daughter was a clone of the Doctor, which meant that she really was Who. So a newer Doctor is marrying an older Doctor's daughter, who is a clone of the newer doctor, but only has half the DNA of the older Doctor."

Frosty P writes "Government auditors have faulted the TSA and its parent agency, the Department of Homeland Security, for failing to properly test and evaluate technology before spending money on it. The TSA spent about $36 million on devices that puffed air on travelers to 'sniff' them out for explosives residue. All 207 of those machines ended up in warehouses, abandoned as unable to perform as advertised, deployed in many airports before the TSA had fully tested them. Since it was founded in 2001, the TSA has spent roughly $14 billion in more than 20,900 transactions with dozens of contractors, including $8 billion for the famous new body scanners that have recently come under scrutiny for being unable to perform the task for which they are advertised. 'TSA has an obsession of finding a single box that will solve all its problems. They've spent and wasted money looking for that one box, and there is no such solution,' said John Huey, an airport security expert."

University of Idaho scientists have figured out a more effective way to track woodpecker populations than following the incessant laughter. They're using a laser onboard NASA's Icesat spacecraft to determine where the birds might be living. From the article: "NASA's Icesat satellite was initially intended for measuring glacial surfaces at the Earth's poles but has proven to be quite effective in measuring vegetation also. The satellite's laser bounces off of forest canopies, tree trunks and the ground making important characteristics about the forest easily measurable. For example, forest density is determined by the relative amount of light returned versus that which is returned from the ground. Once ideal woodpecker locations are identified 'we actually conduct ground-based woodpecker surveys in these locations as well to verify it,' says team-member Patrick Adam."

A survey of American voters by World Public Opinion shows that Fox News viewers are significantly more misinformed than consumers of news from other sources. One of the most interesting questions was about President Obama's birthplace. 63 percent of Fox viewers believe Obama was not born in the US (or that it is unclear). In 2003 a similar study about the Iraq war showed that Fox viewers were once again less knowledgeable on the subject than average. Let the flame war begin!

KenW writes "Mozilla has launched a new marketing campaign to promote Firefox: adopting red pandas and putting them on live webcams. The company wants to underline the fact that the red panda is the mascot for its open source browser via a new section on its site called Firefox Live. It's clear that Mozilla is trying to think of new ways to promote its browser ahead of the launch of Firefox 4. The company has been struggling recently as Firefox steadily loses share to Google Chrome."

Martin Hellman writes "Former Chairman of the Joint Chiefs of Staff, Gen. Hugh Shelton, has dropped a nuclear bombshell, metaphorically speaking. Shelton's recently released memoir Without Hesitation: The Odyssey of an American Warrior, asserts that an aide to President Clinton lost a card containing key phrases needed for ordering a nuclear strike, and that the codes were missing for months. This confirms a similar allegation, made in 2004 by Lt. Col. Robert Patterson, a military aide who frequently carried the 'nuclear football' during the Clinton presidency. Unfortunately, human error within the nuclear weapons complex is a frequent and dangerous occurrence."

An anonymous reader writes "A team from the Massachusetts Institute of Technology's Field and Space Robotic Laboratory has designed a new solar-powered water desalination system to provide drinking water to disaster zones and disadvantaged parts of the planet. Desalination systems often require a lot of energy and a large infrastructure to support them, but MIT's compact system is able to cope due to its ingenious design. The system's photovoltaic panel is able to generate power for the pump, which in turn pushes undrinkable seawater through a permeable membrane. MIT's prototype can reportedly produce 80 gallons of drinking water per day, depending on weather conditions."