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TIL Mice with vision enhanced by nanotechnology can see both infrared and visible light. A single injection of nano-particles in the mice's eyes gave them infrared vision for around 10 weeks with minimal side effects.

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awG1y TIL that Bethlem Royal Hospital was originally a shelter for the poor and accommodation for visiting clergy, before becoming the madhouse nicknamed "Bedlam", and is still a functioning NHS psychiatric hospital
VBvQk TIL in 1992 the UK secretly bought a number of Russian T-80 tanks for $5m each through a fictitious trading company for defense research & development purposes. The UK evaluated the tanks on its proving grounds & also sent one to the US where the Americans evaluated it at the Aberdeen Proving Ground
XE1DD TIL When Taiwan's president in 1995, Lee Teng-hui, had stopped in Honolulu to refuel his plane, the U.S government refused to grant him a visa and forced him to spend the night on his plane. Lee later complained that he was "being treated as a second-class leader."
Me5xW TIL of the Russian "Bitch Wars" following WW2. Prisoners who agreed to fight in WW2 in return for reduced sentences were thought of as bitches by the criminals who refused the offer, and they fought in prison.
5Yprp TIL of the Schiphol fly, which is a fly engraved on urinals at Amsterdam’s Schiphol Airport. The psychology is that men will want to "wash" the fly off the urinal so they focus more when urinating, apparently lowering cleaning bills in public bathrooms.