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Chemistry

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DRINK UP  Astronauts drink water made from recycled urine and other wastewater aboard the International Space Station. A new system would turn pee into drinking water and produce energy, a step toward long-term space travel.

don't pee in the pool

Peeing in the pool creates chemicals toxic enough to be classified as chemical warfare agents. But they’re not the deadliest risk you face in swimming. 

man throwing stone

A man throws a rock toward Israeli border police on the West Bank of the Palestinian territories. A new study by forensic scientists in Israel outlines methods to identify a person’s fingerprints on stones.

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