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TIL '4-F' is a classification given to someone indicating they are “not acceptable for service in the Armed Forces” for any number of reasons. It originated in the Civil War and was used to disqualify army recruits who did not have four front teeth with which to tear open gunpowder packages.

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7rQoL TIL the movie District 9 was made with the money originally planned to make the video game movie Halo. The decision was made by the studios to not make Halo the day they were to start shooting it so instead Peter Jackson and Neill Blomkamp started making District 9.
pYAEp TIL that the gentoo penguin is capable to reach speeds up to 36 km/h, making him the fastest underwater swimmers of all penguins.
Yddr TIL - There is no evidence that Betsy Ross designed the first America Flag. It is very likely that her descendants made up the story in order to get her into the history books.
Zg0R TIL there is a group of Pacific Islanders that can control their pupil dilation and see clearly underwater.
VMdRp TIL a Cornell University study found that social media "Likes" are less likely to affect the self-esteem of people with a sense of purpose (defined as ongoing motivation that is self-directed, oriented toward the future and beneficial to others).