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TIL about industrial melanism,where darkly pigmented insects are selected over lightly coloured ones in industrial areas,because the trees are blackened by soot and provide camouflage.

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xVwM1 TIL About the Cardiff Tower. Hidden in plain sight in a largely Jewish community just south of Beverly Hills, exists a working oil derrick, disguised to look like a Synagogue.
Oor47 TIL: "Noctural penile tumescence" refers to men having erections during the REM phase of sleep. Observation of this can help doctors diagnose erectile dysfunction: if the penis gets erect during sleep, the patient's problem is likely psychological and not a problem of blood flow.
p8nA8 TIL that in 1922 a suitcase containing almost everything the young Ernest Hemingway had written up to that time was stolen in a train station in Paris. No trace of this suitcase has ever been discovered, despite the fact that the unpublished stories it contained would be incredibly valuable.
D1AMY TIL in China they can count to ten using just one hand using a type of sign that everyone uses. 6 is the western 'hang loose' gesture. 7 a snake head, 8 a finger gun, nine an index finger hook and 10 a cross or closed fist.
m1d5O TIL about Art Ackerman, who at age of 98, is currently the oldest person in the world with a weekly radio show. The show fatures mostly old big band music and broadcasts on KDNK in Carbondale, Colorado.