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TIL that Humans (Homo sapiens) or modern humans are the most common and widespread species of primate, and the last surviving species of the genus Homo. They are great apes characterized by their hairlessness, bipedalism, and high intelligence.

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GYggJ TIL Human saliva contains a chemical compound called Opiorphin, a painkiller six times more powerful than Morphine.
d8joB TIL that mongoose were imported to Hawaii to control the rat population, not realizing that the two animals were on opposite sleep schedules (nocturnal/diurnal) and thus innefective.
g414 TIL prior to WWII, Los Angeles had one of the most advanced and efficient light rail systems in the country. This privately-run rail system was purchased by a company owned by General Motors, and slowly dismantled in order to drive demand for more cars and buses.
0wkmv TIL Philip Seymour Hoffman was once starstruck when he found jazz legend Miles Davis swimming in the pool where he was a lifeguard. Hoffman played it cool and pretended he didn't know who the mysterious man was and his indifference earned him an afternoon chat about everything except music.
AkDl TIL Cluster Headaches : Some doctors and scientists have described the pain resulting from ‘Cluster Headaches’ as the most intense pain a human can endure - worse than burns, broken bones or child birth.