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TIL lime juice on skin, when exposed to sunlight, can cause a poison ivy type rash called phytophotodermatitis. It is common for bartenders making margaritas but can also be a problem for basic skincare products like deodorants and lotions that use real lime.

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0d9OR Today I learned that the Five Point Palm Exploding Heart Technique from Kill Bill is somewhat based on reality. It’s called Commotio Cordis, where sudden cardiac arrest can result from a single (not necessarily heavy) blow to the chest at a very particular moment in the heart’s rhythm.
Lmd0 TIL up to 40,000 American women are allergic to their partner’s semen with consequences as severe as diarrhea, hives, and complete loss of consciousness.
1adwd TIL Kim's Convenience actor Paul Sun-Hyung Lee was told to "show up in costume" for his role in The Mandalorian after Dave Filoni saw his cosplay outfits
7rbKr TIL that while young Robert E. Lee worked surveying the boundary between Ohio and Michigan, he jokingly referred in a letter to a snake he killed in a lighthouse as the lighthouse's keeper. Lee's biographer Douglas Southall Freeman misinterpreted this as an admission that Lee killed a human keeper.
b6J7Z TIL about Clochafarmor, a standing stone in Ireland. where the wounded hero Cú Chulainn is said to have tied himself to to the stone in order to remain upright to fight his enemies until his death.