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TIL The cover of Captain America's first issue showed Cap punching Hitler. Some readers took objection, and the publishers received threats and hate mail. The threats proved so serious that police protection was posted with Mayor La Guardia personally contacting Simon and Kirby to give his support.

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Yp8lx TIL Lightning is a source of fixed nitrogen, and thus nitrate. Nitrogen in the atmosphere is highly stable and nonreactive due to the triple bond between atoms in the N2 molecule. Lightning produces enough energy and heat to break this bond allowing nitrogen atoms to react with oxygen, forming NOx.
9nvG TIL the largest plane to ever successfully land and take off from an aircraft carrier was a C-130 named “Look Ma, No Hook” to brag about how it needed neither an arresting hook nor a catapult assist.
GYd1Q TIL Earth's largest waterfall is... underwater. In the Denmark Strait, a warm sea collides with a cold sea, pushing the colder water over a very tall ridge — for nearly TWO MILES (3.2km). That's almost 4x longer than the biggest waterfall on land! From the surface, you wouldn't notice at all.
b69lQ TIL that Canada had a nuclear arsenal until 1984.
yV5DV TIL that in 2013 the United States government technically sued a Mongolian Tyrannosaurus Bataar skeleton