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TIL of the Circumhorizon Arc, aka fire rainbow. This horizontal "rainbow" of colour occurs when the sun or moon is over 50 degrees above the horizon and an arc of light passes thru a very specific kind of cloud (Cirrus clouds made up of ice crystals parallel to the ground), at just the right angle.

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no0P TIL Citizens of the UK have the right to see CCTV footage of themselves and get a copy within 40 days of asking for it.
d8jO7 TIL that the first French territory that seaborne Allied forces captured on D-Day were the Îles Saint-Marcouf islands off the Normandy coast. Although they faced no resistance, the US troops suffered 19 casualties, killed and wounded, from mines that the Germans had left.
MerYA TIL that in 1909, Chicago publisher W. D. Boyce was visiting London and was lost on a foggy street when a Boy Scout helped him find his way, but refused a tip saying it was his good deed ("good turn") for the day. Four months later W. D. Boyce started Boy Scouts of America.
krjm TIL when a airplane crashed in the icy Potomac River, Arland Williams and 5 other survivors fled to the tail section. He was then tossed a lifeline from a helicopter twice and handed it off twice to others more severely injured than himself. He ended up being the only victim to die by drowning.
Oo97L TIL Nearly 700 million people get a mosquito-borne illness each year. 19 diseases are transmitted by mosquitoes include Malaria, Dengue, West Nile virus, Keystone virus, Rift Valley fever, La Crosse encephalitis, Chikungunya, Zika fever, etc. Doctors can typically identify a mosquito bite by sight.