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TIL if microwaves had clear glass windows you would be exposed to the harmful microwaves they emit. The metal mesh screen over the windows have large enough holes for our eyes to see inside, but small enough to block the harmful microwaves that would otherwise be emitted.

78Bg7 TIL Black Soldiers in the Continental Army and states’ militia fought in every major battle of the American Revolutionary War, and in most, if not all of the lesser actions.
xVoVb TIL There's very little proof that vitamin C actually has any effect on preventing or treating the common cold, although after reviewing 60 years of clinical research it was found that when taken daily, vitamin C very slightly shortens cold duration, by 8% in adults and 14% in children.
W7RMd TIL about the White Revolution, a sweeping -- and mostly successful -- program to modernize Iran. One element of it ended feudalism and gave farms to the farmers, but many of them ended up worse off than they were under feudalism. This caused a domino effect that led to the Islamic Revolution.
e0DkL TIL that the legless Artic Explorer Peter Freuchen, who was a member of the Danish resistance during WW2, openly claimed to be Jewish whenever he witnessed anti-semitism, he was imprisoned by the Germans for this reason and was sentenced to death but he managed to escape and flee to Sweden.
b9OYj TIL The bible teaches "When a foreigner resides among you in your land, do not mistreat them. The foreigner residing among you must be treated as your native-born. Love them as yourself" Leviticus 19:33