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TIL all Presidents of the United States (except for Van Buren) are descendants of King John of England.

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kOpA5 TIL that “moonbows” are a natural phenomenon that occurs when (1) the moon is close to full, (2) rain is falling opposite the moon, and (3) the moon is low. Since the moon is the only source of light, the lunar rainbow will appear monochromatic to the naked eye. (More links in comments)
j4GR TIL that Rod Serling, creator and narrator of The Twilight Zone, co-wrote the film adaptation of The Planet of the Apes. He is the one responsible for the famous twist at the end.
EgDVw TIL that the blue jay can be beneficial to other birds, as it may chase predatory birds and will scream if it sees a predator within its territory. It has also been known to sound an alarm call when hawks or other dangers are near, and smaller birds often recognize it and hide.
W4oB TIL Tigers have striped skin not just striped fur. The stripes are like fingerprints and no two tigers have the same pattern.
YpQNW TIL Mars rover top speed is 4.2 cm/ sec.