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TIL that hummingbirds are only found in the Americas (and not in the rest of the world), but the oldest known hummingbird was actually a fossil collected in Germany.

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via reddit.com

Y71VP TIL that a racing greyhound can reach a full speed of at least 21.3 m/s (77 km/h) 47 mph.
QJNrp In September 2015, scientists witnessed something never seen before: two black holes colliding. Both about 30 times as big as our Sun, they had been orbiting each other for millions of years. A fraction of a second before the crash, they sent a vibration across the universe at the speed of light that was picked up by the LIGO detector. So what are these ripples in space? Amber L. Stuver explains. Lesson by Amber L. Stuver, directed by Eoin Duffy.
5VeZ9 TIL Edd Kalehoff who composed and performed The Price Is Right theme is not officially credited for it and has lost millions in royalties from it over his life
nWYW TIL the Moon is about 400 times smaller than the Sun, but it also just happens to be about 400 times closer. The result is that from Earth, they appear to be the same size.
p8X48 TIL The phrase "mad as a hatter" originated in the hat making industry of the 18th century as mercury nitrate was a vital substance used in the production process. This lead to a variety of physical and mental ailments, including tremors (“hatter’s shakes”), speech problems, emotional instabilities.