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TIL that the Dunning–Kruger effect is a cognitive bias in which people with limited competence in a particular domain overestimate their abilities.

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LQlQp TIL that one of the largest known winged insects was a relative of dragonflies that lived 300 million years ago. It was predatory, had a 70 cm (2 ft 4 in) wingspan, and weighed up to 150 grams (1/3 lb).
KYo8G TIL: During the US Civil War, a Minnesota regiment captured a confederate flag, during the Battle of Gettysburg (1863), from the Virginia army. Virginia's made many requests over the years to return the flag, even getting Congress and the President to request it and each time Minnesota has refused.
QJQKL TIL that the city of Hamburg in Germany has a total of 2,496 bridges, which is the most of any city in Europe and many more than cities like Venice, Amsterdam and Saint Petersburg. This has led to Hamburg being referred to as "the Venice of the North".
GYXbN TIL the likely record for fastest manmade object is a manhole cover launched by a nuclear bomb. A high-speed camera recording the lid only caught one frame of it moving meaning it was traveling over 125,000 miles per hour
lo4bA TIL of Henry Lucas, who in 1663 founded a professorship of mathematics at Cambridge University. The "Lucasian Professor of Mathematics" has become hugely prestigious, with holders including Isaac Newton, Charles Babbage, Paul Dirac and Stephen Hawking.