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TIL that Acacia trees developped a defense response to giraffe browsing by increasing their thorn length, tannin production within leaves and airborne tannin release. This triggered a change in the giraffe's behaviour which adapted to move upwind and eat fewer leaves per trees.

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nWopd TIL the the deer is America’s deadliest animal according to CDC
vPRLj TIL of the Chinese submarine Ming III, which was found drifting by fishermen in 2003 after all the crew asphyxiated from the diesel engine using all the oxygen. The dead sailors were all at their posts, implying they died quickly without knowing there was a problem.
5V9Qr TIL that Rüppell's griffon vulture has the highest documented altitude of any bird at 36k feet. Unfortunately this information was discovered after a Boeing 747 took the bird into the engine over western Africa.
WkV4o TIL of Carl Lutz, who is credited with saving 62,000 Bulgarian Jews almost singlehandedly.
QgPp TIL Stilton blue cheese is known to frequently cause odd, vivid dreams