Promising new research on Alzheimer's Disease Ethical guidance for stem cell research Dietary guidelines issued as new Food Pyramid Website of the Week: Food and Nutrition Information Center Mac and Windows updates feature better search Education, visas faulted in technology competitiveness 'Smart' plastics
Earth Day marked in 140 countries Paleo-anthropologist Richard Leakey sees global warming as a threat to conservation Website of the Week: Earth Day Network Astronomers find distant clue to planet formation Hubble's future at risk on telescope's 15th anniversary
Deadly virus sent to labs in test kits A polio anniversary Possible hope for a Hubble fix Tracking ancient migrations through DNA Website of the Week: Migration information Panel recommends nationwide umbilical cord blood bank A listener's question answered on how night vision goggles work
Space shuttle Discovery is moved to its launch pad States challenge federal rules on power plant mercury emissions Website of the Week: Science News for Kids The search for an avian flu vaccine Older Americans worried about the cost of health care A new report on spinal cord injury research
Earth's ecosystems threatened, says Millennium Assessment Report assesses natural disaster "hotspots" Website of the Week: Earthquakes monitored NASA offers cash prizes for innovations Americans sleep habits have have health implications Mothers and children are focus of World Health Day Organizing to conquer malaria
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