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TIL Hippos have red sweat that is frequently mistaken for blood

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nWE4B TIL on the Soviet supersonic plane Tu-144 it was so noisy people sitting next to each other could only hear each other by yelling. People sitting two seats from each other couldn't hear each other even screaming.
VMLJ8 TIL that Mister Rogers once used an egg timer and simply let it run for sixty seconds on a television broadcast—in order to demonstrate how long a minute is. Unlike most TV made for kids, "Mister Rogers’ Neighborhood" was deliberately slow and contemplative.
69AZ7 TIL in 2008 a Supreme Court of Maryland ruling cited the episode of Seinfeld where Jerry tries to return a jacket "for spite". The case was between legendary author Tom Clancy and his ex-wife, who argued Tom couldn't remove his name from their book partnership out of spite.
VMaW0 TIL that snapping shrimps (the family Alpheidae), which grow to only 3-5cm long, compete with sperm whales for title of loudest animal in the ocean. Their snaps are capable of stunning fish and breaking glass jars. In numbers, the shrimp can interfere with sonar and underwater communication.
0X1p TIL if all of Canada was one state in the US, it would have 50 electoral votes – fewer than California.