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Opinion, arguments & analyses from guest experts and from the editors of Scientific American

The AMA eases its stance on marijuana

The Obama administration announced last month that people who buy or sell medical marijuana in the growing number of states that have decriminalized its therapeutic usage should not be targeted for arrest or prosecution by federal authorities...

November 17, 2009 — Carina Storrs

In 2012 neutrinos melt Earth's core, and other disasters

During an early screening of Roland Emmerich's latest disaster flick 2012, which opens today, laughter erupted in the audience near the end of the film thanks to corny dialogue and maudlin scenes (among the biggest guffaw getters: a father tries to reconnect with his estranged son on the telephone, only to have the son's house destroyed just before he could say anything)...

November 13, 2009 — Philip Yam

New recipe looks back for how to feed the world

When it comes to feeding Earth's masses of people who regularly go hungry, a few things are clear: communism's large-scale, collective farms don't work, and breeding for specific traits in staple crops can boost yields, sometimes significantly...

November 13, 2009 — David Biello

NASA prepares effort to free stuck Spirit Mars rover

Six months after the Mars rover Spirit became trapped in a patch of soft soil, its controllers are preparing to send a set of commands that they hope will free the robotic explorer, NASA announced Thursday...

November 13, 2009 — John Matson

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