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TIL If you you experience auditory hallucinations (specifically sounds as opposed to voices) as you fall asleep or as you are waking up they are considered normal and up to 70% of people experience this occasionally. Hearing them in the middle of the day is not.

LQygV TIL about a refrigerator in the 1920s co-designed by Albert Einstein for the poor. The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate.
KYr7a TIL while viewing a solar eclipse on 18 August 1868, French astronomer Pierre Janssen made an observation that led to the discovery of helium. It was the first time a chemical element was discovered on an extraterrestrial body before being found on the earth.
w5y7 TIL that only Bryan Cranston (Hal), Justin Berfield (Reese) and Erik Per Sullvian (Dewey) were the only characters to be in every Episode of Malcolm in the Middle. Frankie Muniz missed out on one episode.
5YXLB TIL Great Western train company apologised when passengers were shocked by announcement made after a fatality on the line. "Someone couldn't be bothered to live any more. Because of this, there are severe delays. Some of you have missed your connecting flights for the Bank Holiday".
E1YJ7 TIL about the Tree of One Hundred Horses, a massive chestnut tree that holds the world record for girth, clocking in at 190 feet in circumference—nearly the length of a hockey rink.