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| Science, August 29, 2008
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 Science, August 29, 2008PDF | English | 7.8 MB
Cover
A black-chinned hummingbird (Archilochus alexandri) drinks nectar from a flower of wild tobacco (Nicotiana attenuata). Nicotine in the nectar moderates its consumption by the hummingbird and protects against predators; the flower lip produces benzyl acetone, which attracts pollinators. Together, the repellent and attractant maximize the plant's reproductive fitness.
Ancient Earthmovers of the Amazon
The forested western Amazon was once thought barren of complex human culture. But researchers are now uncovering enigmatic earthworks left by large, organized societies that once lived and farmed here.
The Western Amazon's "Garden Cities"
A U.S.-Brazilian research team reports finding a set of "garden cities" built in the forests of the south-central Amazon as early as 1250 C.E.
A Controversial Bid to Thwart the "Cantonese Cancer"
Zeng Yi has spent 3 decades probing a connection between Epstein-Barr virus and nasopharyngeal cancer. A new vaccine should show whether he is on the right track.
Mortality Survey Offers Mixed Message
Cancer has become the number one killer in urban China, causing one in four deaths, although screening and prevention programs have reduced mortality rates for some cancers.
Life After Death
How is a dead massive star still able to energize extremely relativistic particles?
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Author: tomkien 12 September 2008 Comments (0) |
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