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TIL Xylitol, a product that is harmless to humans but toxic to dogs, is found in some peanut butter brands.

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ZpMyQ TIL that the quasar 3C 273 is so incredibly bright that if it were 36 lightyears away it would appear brighter than the sun in our sky, and is 4 trillion times brighter than our star.
wLlZ7 TIL Darwin's Beetle (Chiasognathus grantii) have giant mandibles (more than 1/2 their body length) they use to battle males as they climb trees where females are found for a chance to mate. The mandibles can hook rivals under the wings to throw them off the tree, as well as the female after mating.
GYaDJ TIL about Vaslav Nijinsky – who has been cited as the greatest dancer of the 20th century. He was a controversial character in Russia who pushed the boundaries of what was permissible in ballet, including references to homosexuality and masturbation.
Rybl TIL on average, the center of gravity is about three percent higher in blacks than whites. This partially explains why blacks are better sprinters and whites are better swimmers.
R7Lx9 TIL about Alejo Garza Tamez a 77 yo mexican hunter whom on 2010 was given 24 hours, by cartel members, to leave his ranch. Instead he armed himself, waited for them and managed to kill 4 sicarios, injure 2 more and make the rest run away.