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flamingos

A LEG TO STAND ON  Scientists have tackled the question of how a biggish bird can balance, and apparently nap, on just one skinny leg.

Pueblo del Arroyo

IN NEW LIGHT  Recent research suggests that the ancient Chaco society of the U.S. Southwest was founded by locals and run by a female lineage for hundreds of years. The best-known Chaco structures are great houses, massive, multilevel buildings represented here by the remains of Pueblo del Arroyo.

double-slit experiment

DO THE WAVE  Quantum matter acts like both a particle and a wave, as demonstrated by the famous double-slit experiment (illustrated above). Electrons sent through a pair of slits interfere like waves, creating peaks and troughs. This wave nature of matter could be used to create a tractor beam that could reel in atoms or molecules, a new study proposes.

obsidian tool

WELL TRAVELED  A new chemical analysis finds that this 41,000- to 32,000-year-old obsidian tool, previously unearthed in a Syrian rock-shelter, was transported more than 700 kilometers. That means that long-distance movement of obsidian into the Middle East occurred much earlier than previously thought, researchers say.



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