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TIL The internal GPS of a specialized tracking mount for solar astronomy takes two minutes for its sun-sensor to detect the sun. It can also model the sun's position if it goes behind a cloud

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via reddit.com

gM0Xb TIL about Patient TN, who suffered two strokes permanently damaging his brain’s visual lobes. Despite being consciously blind, TN was able to navigate through a cluttered obstacle course perfectly, as his subconscious vision, aka “blindsight”, was still intact.
p8ybN TIL that Roger Fenton's 1855 Crimean War photo series is the first historic attempt to portray a war campaign with the help of photography
Zrlp TIL polar bears are so well insulated from the cold that it is invisible when photographed with infrared film, which detects heat. Except for a spot in front of its mouth made by its warm breath.
yVkPX TIL in California there have been more than 200 attempts over the years to break up the state.
grvxb TIL that David Bowie's 'Time will crawl', was inspired by the Chernobyl disaster and its fallout. It was originally titled 'How we war'.