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TIL that gravitational waves have a frequency conveniently within the range of human hearing. This is the sound of two black holes spiraling into one another, echoing through the universe for billions of years

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4V7N TIL carats are for gemstone weight, while karats are for precious metal purity
m1kPx TIL More than 24 million years ago, bears and raccoons shared a common ancestor. This explains why the Giant Panda, despite being a bear, share characteristics that are common to both bears and raccoons.
Rxv8 TIL: Seth Rogen and Evan Goldberg are to make a movie about the 90s battle between Sega and Nintendo.
BwLL TIL that Kelloggs made their cereal boxes thinner in 2008 but kept the price the same so that buyers wouldn’t perceive the smaller size box when viewed from the front.
VMK1Z TIL until 1929, less than 100 years ago, man didn't know there were other galaxies outside of the Milky Way. Edwin Hubble and his "computer", a woman named Henrietta Leavitt calculated stars called cepheids could accurately measure long distances, proving the Andromeda "nebula" was a separate galaxy