black hole analogs
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Physicists Create ‘Urine Black Holes’ To Solve The Splashback Problem
Good news for khaki-clad men plagued by speckled staining of their trousers from urine splashback: physicists may have found the optimal splash-suppressing design for a urinal insert, thereby creating a “urine black hole.” Urine gets in, but it can’t get back out.