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	Scientists Push Back Human Arrival in Americas
			June 30, 2008 Report Until recently, most scientists thought the first humans got to North America 13,000 years ago, but new findings suggest they may have arrived earlier.


	Clear Fish Give Research a Boost
			June 25, 2008 Update Oncologist Richard White has bred a new, see-through, zebrafish. The animals' transparent skin gives scientists a clear view of processes such as tumor growth in real time.

Alternative Fuels

Polar Discoveries

Space Storms


	Alternative Fuels

	May 15, 2008

	Carmakers are looking to alternative fuels such as ethanol, natural gas and hydrogen to improve fuel economy, decrease greenhouse gas emissions and transition from foreign to domestically produced fuels. In this in-depth report, learn about the science and politics of alternative fuels, and explore how your car's fuel costs and emissions stack up to similar alternative fuel vehicles.


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