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TIL that a 500 page book contains only 0.53 calories

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v1omj TIL that Vikings were keen skiers, they even worshipped a god in its name. Medieval sources have very limited material on the god Ullr, but he's almost always shown on skis carrying a bow. In one text, it is said that Ullr can be called ski-god, bow-god, hunting-god and shield-god.
4XwJJ TIL biblically accurate angels are very different from well-known description of the an angel - Old Testament depict one of them (Seraphim) as six-winged, flaming creature continuesly chanting "Holy, holy, holy" and the other (Ophanim) as pair of wheels with multiple eyes
KOa94 TIL In the late 1500s, two Dutch spectacle makers stacked a number of lenses in a tube and realized that, together, they made items appear much larger than under a single magnifying glass. Because the maximum magnification was only 9x, they were more of a novelty than a scientific instrument
GaN7 TIL that in 2014, the asthma medication albuterol sulfate jumped in price from $11 for 2 tablets to $434, an increase of almost 4,000%.
8a8yX TIL that one of the most famous lines in movie history, "You're going to need a bigger boat" from Jaws, was actually an ad-lib on set; furthermore, the audience screams at test screenings obscured the line, leading to a longer pause before hearing the line.