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pYyo4
TIL forms of brain training, including music and chess, do little to improve cognitive abilities except for the specific trained skill and similar skills
OG4J7
TIL that snot becomes yellow when you're sick because of chemicals released by white blood cells that are in the mucus to fight infection; green snot indicates even higher levels of those chemicals
pYJbZ
TIL why insects circle lights at night: They evolved to become masters of flight by relying on the brightest thing they see — the sky — to know which way is up and keep their back toward it. At night, they confuse artificial light for the sky, ending up trapped in a cycle trying to stay orientated.