› added 12 years ago

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TIL that Birds are capable of seeing a 4th primary color (in the ultraviolet spectrum) totally invisible to humans. It allows them to see a both a totally different fundamental color, and all derivatives obtained by mixing it with the other three primary colors. The color Shmurple does exist.

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5DeQ TIL American coinage was made using definite measurements. 16 pennies stacked equals 1 inch and 16 pennies in a line equals 1 foot.
5Yoep TIL an experiment was conducted into the movement of Apatosaurus tails. It's possible that the dinosaurs may have been able to use their tails like whips and make a sonic boom.
R7Dw7 TIL Orcas, or "killer whales," are actually dolphins.
EggYW TIL that The Goodies' classic episode "Kitten Kong" (S02E07) is the only episode from the series officially missing from the BBC archives, with the original video tape having been wiped for reuse in the 1970s.
5VoLk TIL Duct tape was invented by an Illinois mom during WW2. She had to write a letter to FDR explaining how it's easier for soldiers(including her sons) to pull her tape off in battle without using a knife.