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a photo of Angkor Wat temple

WATERED DOWN  Medieval Angkor suffered a big blow when the city’s water system reacted badly to a fluctuating climate, a study suggests. Angkor Wat temple — a popular tourist destination — was once part of Greater Angkor.

illustration of an electron

ROLY-POLY  An electron (illustrated) orbits an atom’s nucleus, with a cloud of other hypothetical subatomic particles that could squash the electron’s shape. But so far, measurements show that the electron seems to be almost perfectly round, providing no hint of yet-to-be-found particles.

tornado

TWIRLING TERROR States such as Mississippi, Alabama and Tennessee are seeing more tornadoes each year than in the past, a study finds.

AI drug chemical structure illustration

DRUG DATA  A new computing system lets pharmaceutical companies pool data to train AI programs for discovering new medications — without having to share confidential information with competitors.



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