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TIL researchers have found that the ancient Romans manipulated chemistry to make "quicklime" that caused "self healing" concrete, thereby preserving ancient Roman architecture, and answering why so many of their structures remain standing when modern structures fail.

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rNXQw TIL that the world record for the longest cutscene in gaming history is the epilouge cutscene in Metal Gear Solid 4 with a length of 71 minutes. Second place is the pre-final battle cutscene for the game Star Ocean: The Last Hope with a length of 46 minutes.
7rmJr TIL of beaked whales, a set of 22 species of whales with beaks like dolphins, some of which reach sizes of over 42 feet and which prey on colossal squid in the deep sea.
Ko9a TIL the phrase to ‘blow a raspberry’ is derived from cockney rhyming slang in which you rhyme your desired word (fart) with another word that is used in a sensible phrase (raspberry tart), then use the non-rhyming word for the original word (raspberry=fart).
x6eP7 TIL of the lesbian Blood Sisters, who, starting in San Diego in 1983, gave their own blood and organised blood drives to make up the shortfall after gay men were banned from donating because of the AIDS crisis.
Wkx94 TIL that the phrase ''Pushing The Envelope'' is not about the container for letters- but is related to a mathematical graph of aerodynamic performance on which the envelope is the boundary line representing an aircraft's capabilities.