* Did a modern-day scourge save ancient Earth?: A gas blamed for global warming may once have helped Earth escape a deep freeze, some scientists propose. ...
* "Real" Crusoe's isle said to yield clues to sojourn: The tale of the marooned Robinson Crusoe is thought to be based on the actual story of sailor Alexander ...
* "Other half" of Darwin's theory passes test: Some flirtatious microbes have confirmed Darwin's view of how sexual advertising evolves, biologists say. ...
* Found: earliest known animal tracks?: Scientists claim to have found possibly the earliest animal footprints, but admit their report will stir skepticism. ...
* NASA: snow found in Martian skies: It's not certain whether the flakes ever reach ground, researchers say. http://www.world-science.net/othernews/080929_snow...
* "Historic"; collider operation begins: The first beam in the world's newest and largest particle collider was switched on this morning, physicists announced. ...
* Robotic helicopters teach themselves stunts: The research is a prelude to designing choppers that search for land mines or fight fires, scientists predict. ...
* Dolphins and the evolution of teaching: By repeating actions many times and seemingly "pointing"; at things, some dolphins appear to teach their young to...
* Washington's doctors absolved: The statesman was beyond help when his much- maligned doctors found him one fateful morning, a study concludes. ...
* Drug may trick body into "thinking"; it exercised: A new study is creating both hope, and worries that a remarkable substance could be ripe for abuse. ...
* Tit-for-tat: birds found to repay wartime help Pied flycatchers and red-winged blackbirds share two traits, studies suggest: they're feisty defenders and...
* Penguin populations falling steeply: biologist Like the proverbial canary in the coal mine, penguins are sounding the alarm for possible environmental...
* The Odyssey astronomically accurate?: The ancient Greek epic of adventure at sea and long-awaited homecoming may have more truth than suspected, scientists...
* Almost "uncontacted" tribe revealed in photos: Rare photos were released to highlight the perils facing peoples living remote from the modern world. ...
* Tests back up theory of hot springs on Mars: Mars may have experienced life-giving processes similar to those that occur at Yellowstone National Park,...
* Dip in brainpower may follow drop in real power: Researchers say low status seems to erode mental function -- with complicated implications for society. ...
