nucal - Slashdot User

Submission + - Dying Man Shares Unseen Challenger Video (nycaviation.com) 1

Submitted by longacre on Monday February 01, 2010 @12:47AM

longacre writes: An amateur video of the 1986 Space Shuttle Challenger explosion has been made public for the first time. The Florida man who filmed it from his front yard on his new Betamax camcorder turned the tape over to an educational organization a week before he died this past December. The Space Exploration Archive has since published the video into the public domain in time for the 24th anniversary of the catastrophe. Despite being shot from about 70 miles from Cape Canaveral, the shuttle and the explosion can be seen quite clearly. It is unclear why he never shared the footage with NASA or the media. NASA officials say they were not aware of the video, but are interested in examining it now that it has been made available.

When the Earth Was Purple 278

Posted by kdawson on Wednesday April 25, 2007 @04:38AM from the how-violet-was-my-valley dept.

Ollabelle writes "It's always been a bit of a mystery why plants absorb red and blue light, reflecting green, when the sun emits the peak energy of the visible spectrum in the green. A new theory offers one possible answer: that the first chlorophyll-utilizing microbes evolved to exploit the red-and-blue light that older green-absorbing microbes didn't use, eventually out-competing them through greater efficiency and the rise of oxygen."

Submission + - Wikipedia Used for Artificial Intelligence

Submitted by

eldavojohn

on Sunday January 07, 2007 @11:13AM

eldavojohn writes: "It may be no surprise but Wikipedia is now being used in the field of artificial intelligence. The applications for this may be endless. For instance, the front of spam fighting is a tough one and it looks as though researchers are now turning towards an ontology or taxonomy based solution to fight spammers. The concept is also on the forefront of artificial intelligence and progress towards an application passing the Turing Test and creating semantically aware applications. The article comments on uses of Wikipedia in this manner:
"... spam filters block all messages containing the word 'vitamin,' but fail to block messages containing the word 'B12.' If the program never saw 'B12' before, it's just a word without any meaning. But you would know it's a vitamin," Markovitch said. "With our methodology, however, the computer will use its Wikipedia-based knowledge base to infer that 'B12' is strongly associated with the concept of vitamins, and will correctly identify the message as spam," he added.
"

Submission + - Open Project to Develop Renewable Energy System

Submitted by

rohar

on Sunday January 07, 2007 @11:02AM

rohar writes: "We have been working on a system that combines some existing indirect solar technologies to build a location independant, renewable, reliable and economically feasible indirect solar electrical power generation system. The idea is to "roll-your-own" geothermal source by capturing heat from the ambient air with a solar powered absorption heat pump, store it underground and generate electricity from the air cooling convection. When the air is cooler the stored heat is then used in a reverse process to generate electricity by transferring the heat back to the air when it is cooler (at night or seasonal). There are many additional benefits including clean water capture from the "dehumidifier" effect of the air cooling, construction from common materials and thermal storage that may be incorporated into dwelling heat systems."

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