NASA launch managers this morning cleared space shuttle Endeavour to lift off before dawn Sunday from Kennedy Space Center in Florida, one of the five remaining flights before the shuttle program concludes this year or early next. The planned launch comes less than a week after the future of human spaceflight in the U.S. was shaken by President Obama, whose budget request for fiscal year 2011, released Monday, would cancel Constellation , the planned successor to the shuttle. [More]

Despite the frightening regularity of humanitarian disasters like the earthquake in Haiti, international responses remain fragmented and must be improved, argue a group of trauma surgeons.

Carbon emissions from air travel could be reduced, thanks to a new collaboration between engineers in the UK and the aerospace industry. The million project will investigate new ways of using composite materials for wing panels in aircraft. The research will be using carbon fibres that are curved within flat plates to produce damage-tolerant, buckle-free structures.

N-acetylserotonin, the immediate precursor to melatonin, activates the same growth circuits in the brain as BDNF (brain-derived neurotrophic factor). The results have implications for how some antidepressants function and suggest that the molecules and pathways involved in mood regulation and circadian rhythms are intertwined.

It takes special software to map the universe from noisy data. Scientists have developed a code called MADmap to do just that for the cosmic microwave background, then posted it on the web for other interested sky mappers. Scientists probing the sky with the PACS instrument aboard the Herschel satellite have adapted MADmap to make spectacular images of the infrared universe.

Scientists have made a significant step towards developing a so-called "artificial pancreas" system for managing type 1 diabetes in children. The team has developed and successfully tested a new algorithm, providing a stepping stone to home testing for the artificial pancreas.

Most of us probably think of sperm as rather active little cells, swimming with quick movements of their "tail" or flagella. But actually sperm's motility is in fact short lived. When in the male reproductive tract they have to rest easy, lest they wear themselves out prematurely and give up any chance of ever finding an egg.

The Fish and Wildlife Service has rejected a bid to extend endangered species protection to a rabbit-like creature that environmentalists say could be pushed to extinction by rising temperatures.

The warming of the American pika's mountain habitat in California's Sierra Nevada and in parts of nine other Western states has shrunk the tiny mammal's population and could eliminate part of its range, but federal biologists say new studies suggest the pika will adjust to warmer homes or migrate to cooler areas upslope.

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The brain's innate interest in the new and different may help trump the power of addictive drugs, according to new research. In controlled experiments, novelty drew cocaine-treated rats away from the place they got cocaine.

Researchers make new material to clean up oil spills in factories or on the ocean, and conserve the oil.