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TIL why radar side lobes are detrimental to radar accuracy. They allow echos and jamming to be received by the radar antenna despite the fact they do not come from the direction the antenna is pointed to. Once received, there is no simple way of distinguishing them from the wanted signals.

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NZVe TIL the LGBT triangle originated during Adolf Hitler’s rise to power. It was used to identify male prisoners who were homosexual. Originally intended as a badge of shame,the pink triangle (often inverted from its Nazi usage) has been reclaimed as an international symbol of the gay rights movement.
EgWQw TIL the longest word in any language is the chemical name of the titan protein which is 189819 letters.
dDM4E TIL that in 2012, the National Reconnaissance Organization (NRO) gifted NASA two space telescopes with capabilities exceeding that of the Hubble telescope. For example, the telescopes have shorter focal lengths, which in turn gives them a field of view that is 100x larger than Hubble.
yVBVa TIL that Sweden switched from driving on the left side to the right side on 3 September 1967 and that day is called Dagen H or H Day and it was by far largest logistical event in Swedens history.
4N6X TIL that some people believe Jesus escaped crucifixion, fled across Asia, settled in modern-day Aomori prefecture in Japan, and became a rice farmer.