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Scientists are divided about the USA's decision to renege on the agreement to destroy its last stock of smallpox. This is one of the organisms apparently developed into Soviet biological weapons, says defector Ken Alibek, aka former Soviet microbiologist Colonel Kanatzhan Alibekov. Are the 5,300-year-old signs incised on pottery discovered in Harappa, Pakistan, the oldest known writing? Physicists at the Stanford Linear Accelerator Center are trying to discover why there was anything left in the universe after the Big Bang – and where all the antimatter went.