› added 1 week ago

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TIL a California serial killer dubbed the “Tipster Killer” would anonymously call a crime‑tip hotline after each of his murders—providing directions to his victims’ bodies so he could collect the reward.

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via reddit.com

nWdk9 TIL that Euler was functionally blind. In 1738, he became nearly blind in his right eye, earning the nickname "Cyclops" from Frederick II; by 1766, he lost vision in his left eye as well. Despite this, his productivity actually surged: in 1775, he wrote on average one mathematical paper per week
Zbnv TIL New York Subway trains have been running for 24 hours a day since it began operation in 1904
EA5X TIL Photoshop won’t allow you to edit pictures of currency.
xV7D1 TIL that lodestones (natural magnetic stones) are very probably made when a lightning strikes ferrite stones ; a scientist proved it by sending a small rocket containing this type of stone into a storm cloud and the stone returned magnetic
B9ey TIL: That small plastic spheres are floated on top of reservoirs to help stop evaporation during droughts.