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TIL Ameland island, Netherlands, eliminated red in the light spectrum of streetlights and nearby offshore platforms since migrating birds took the cue to communicate all night long, and disoriented birds' internal compasses causing exhaustion. Blue-green lights increase migratory bird survival.

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awrwL TIL about "paired kidney exchange", which allows you to donate your kidney that wasn't a match for your intended recipient (spouse, child, etc.) to a stranger but in turn receive a kidney that is a match for your loved one. Instead of two people going without a transplant, both get a transplant.
e0KL5 TIL of the 1804 Haiti massacre that was carried out against the remaining white population in Haiti by Haitian soldiers. Squads moved from house to house, torturing and killing entire families. These events polarized Southern U.S. public opinion on the question of the abolition of slavery.
AD7Xa TIL About The Phoebus Cartel - A secret organization which intentionally shortened the lifespan of light bulbs to force consumers to buy bulbs more often.
nOno TIL One minute each night, skyscrapers, tugboats, hotels, a yacht club and police cruisers send a blinking goodnight message to sick kids inside Hasbro children’s hospital Providence. R.I.
Do9e TIL Ocean thermal energy conversion, a technology invented at the end 19th century, has the potential to satisfy twice the global electricity demand without affecting the temperature of the ocean or the world’s environment.