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TIL that the world's oldest known wooden wheel is over 5,000 years old. Discovered in 2002 in Slovenia, this ancient artifact dates back to between 3,350 and 3,100 B.C., providing insight into early human innovation.

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69Qdw TIL about Scheele’s Green (aka Schloss Green), an arsenic-laced artificial color very popular in the 19th century, showing up in artificial flowers, candles, toys, fashionable ladies’ clothing, soap, beauty products, confections, and wallpaper and leading to scores of deaths.
wowJE TIL of the Colditz Cock, a glider built by British POWs imprisoned in Colditz castle in WWII. Made mostly of stolen wood and cloth, the glider could fit two men and was constructed in an attic above the chapel. The POWs finished the glider just before being liberated, and it never flew.
XxMr TIL an Australian TV presenter wore the same suit on his show for an entire year to bring attention to the different standards his female counterparts are held to. Nobody noticed the whole time.
Ypnlv TIL The bottlenose dolphin sleeps by shutting down half its brain along with the opposite eye. The other half remains awake at a low level of alertness to watch for predators and to surface to breath. After about two hours it reverses the process so the other half can rest.
vpax TIL a Peruvian football club tried to avoid relegation by moving their stadium to one of the highest cities in the world, so their opponents would suffer from altitude sickness. Oh, and their nickname was “Los Wankeros”.