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TIL that most symbols we use in mathematics can be neatly categorized into the following categories: constants, variables, delimiters, operators, relational symbols and notational symbols

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9w89r TIL Montpelier, Vermont is the only state capital without a McDonald's.
D14Eg TIL that Loveseats were not invented so that two lovers could sit together. Originally, they were just oversized chairs designed to allow more space for excessively wide women's dresses up until the 18th century.
Egr9P TIL the name of the fighting machine the "Tank" got its name because of subterfuge, as the British wanted to pass them off as water tanks bound for Russia.
5VO88 TIL about Multiocular O (ꙮ), a rare glyph variant of the Cyrillic letter O. Only one single use of this glyph is know, in a 15th century manuscript, in the Old Church Slavonic phrase "серафими многꙮ҄читїи"
4Ga5 TIL that bumblebees are capable of flying at altitudes higher than Mt. Everest. Two bees were able to fly at simulated altitudes of 29,525 feet inside a plexiglass chamber. The plexiglass kept breaking before the bees stopped flying.