 How and Why The prototypical hydrogen-car is powered by electrical current from a fuel cell, a device that combines hydrogen and oxygen to produce electricity. The principle involved is a schoolroom classic. The cars may be able to claim zero emissions, but powering up their fuel cells can be environmentally expensive. (Alamy)
Apollo 11's 40th Anniversary 
The frozen landscape, dry valleys and active volcanoes that make up Antarctica provide a living laboratory for scientific study and a wondrous journey for those traveling to the ends of the Earth. Experience the continent with this special report.
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Scientists hope the information buried in corn's 32,000 genes and 2.3 billion letters of DNA may help sustain the century-long improvement in yield and hardiness into an era of climate change and, possibly, food shortage.
Australia's star symbol lives in the rolling hills and flat plains where eucalyptus trees grow. But as people move in, koalas are finding fewer trees, researchers say. As a result, the stress is bringing out a latent disease that infects 50 to 90 percent of the animals.
More Science Headlines
Hackers steal electronic data from top climate research center: Scientists' e-mails deriding skeptics of warming become public (Post, November 21, 2009)
Mercury poses danger for those at the top of the food chain (Post, November 17, 2009)
Cleaner chlorine plants may be creating a mercury glut: Cleaner chlorine plants may indirectly be creating an excess of toxic metal (Post, November 17, 2009)
Science scan (Post, November 17, 2009)
More water discovered on the moon (Post, November 14, 2009)
Apes to be released into the wild: A rehabilitator plans to start releasing rescued orangutans back into Borneo's forests. But there are concerns whether the tamed apes will survive out there. (Post, November 14, 2009)
Potomac Conservancy blames chemical runoff for intersex fish: Conservancy suspects hormone-, drug-tainted runoff and sewage (Post, November 12, 2009)
The costs of dangerous debris: Experts see rising costs as debris threatens orbiting craft (Post, November 10, 2009)
U.S. military expands efforts to track satellites: 'It's amazing what one collision will do to the resource spigot' (Post, November 10, 2009)
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