What's Hot This Week The Brain in 3-D: New Research Illuminates Cell Circuits by Janelle Weaver For the first time, scientists have reconstructed a three-dimensional circuit of connected cells in the brain's seat of consciousness.     Tiny Orgy: Billions of Beasts Fossilized in Act of 'Naked' Sex by Charles Q. Choi Orgies of sometimes billions of trilobites have been discovered, ones captured in a torrent of mud right after these extinct creatures ditched their hard shells to get up close and personal.     Sponsored by: Lifestyle Change Still Trumps Best Diabetes Drug Image Gallery: Knut's Life Health App Downloads Soar, But Do They Work? Infographic: Fuel at Fukushima Daiichi Reactors Odd Form of 'Love' Hormone Found in Some Monkeys

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