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TIL Muggles is an old 1920’s term for marijuana

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OGb5X TIL the Sonic Hedgehog protein is a key signaling molecule in human embryos that helps control how the brain, face, and limbs form. Without it, major body parts wouldn’t grow in the right places.
XEMy8 TIL that in 2011, the Twin Cities experienced such extremes in weather that the day the last of the snow finally melted, it was 103°F.
b6lR9 TIL that the common human silhouette found on many traffic/information signs is unofficially referred to as "Helvetica Man", due to its near-universal acceptance.
Egg57 TIL dolphins can use their echo-location to examine an object, and then later have the ability to recognize it in person or on a video monitor.
Mejob TIL that a genetic mutation in lionesses can lead to them growing a mane, giving their pride a higher status over other prides