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TIL The Rarámuri people of northwestern Mexico are the world's finest endurance runners. Distances up to 435 miles (700km) without rest are on record, and running 200 miles (320km) or more is commonplace. They do this in rough mountainous terrain in sandals or completely barefoot.

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gr7bW TIL about the Nivelle Offensive a Franco-British operation on the Western Front in the First World War which was named after General Robert Nivelle, the commander-in-chief of the French metropolitan armies, who led the offensive. The failure of the offensive caused the French army to mutiny.
QJ6oM TIL that computers have been around since the 1600s. Computers were originally just people who would do calculations and compute things. In the 19th century, computers were usually teams of women who would do complex calculations by hand. As a result, the earliest programmers were also women.
85mG TIL Killer Whales are the apex predator of the sea. They can kill any other sea creature, including the Great White Shark, with a technique of flipping the shark upside down until it suffocates. Killer whales have minds of their own, high intelligence, and have no competition in the sea.
x6pkB TIL that the Centralia Mine Fire in Centralia, Pennsylvania has been burning continuously since at least 1962. It stretches across 8 miles (13km) & at depths of up to 300ft (90m). It has made the surrounding land unstable & the residents were relocated
GjN5 TIL that US research shows that young adults aged between 20 and 24 and born in the 1990s were more than twice as likely to report that they had had no sexual partners since the age of 18 than young adults of the same age born in the 1960s