You, a Dog, and an Elephant All Pee for 21 Seconds

The video explores the commonality among mammals of taking about 21 seconds to urinate, regardless of bladder size, due to physiological and fluid dynamics factors. Larger animals have wider urethras and more hydrostatic pressure, balancing the urination time. Research in 2014 confirmed this phenomenon, with exceptions for small and aquatic mammals. The findings have practical applications in engineering and suggest differences in urinary disease studies between small animals and humans.

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