Whatever it was that rocked Central Siberia back in 1908, echoes of the explosion still reverberate in scientific argument. Farmers 40 miles away from the center of the blast were knocked down by the pressure wave and burned by the flash; trees 30 miles from the center were blown over. But no one is yet sure what actually happened.
Writing in Nature, Physicist Clyde Cowan of Catholic University of America, along with Geophysicist Chandra Atluri and Nobel Prizewinning Chemist Willard Libby of U.C.L.A., offer the most ingenious theory so far. After disposing...
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