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TIL on the island of Papua New Guinea, there are a number of species of green lizards that have green bones, green hearts, green tongues, and green blood.

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jXaN TIL that the billions of galaxies we can see may only represent about 3% of total number out there
b6Pm9 TIL the Norwegian government pension fund has over 1.7 trillion US dollars (~325,000 per citizen). This is 1.5% of the world's listed companies, the result of decades of investing oil revenues. Some companies can't be in the portfolio due to ethical concerns, e.g. Lockheed Martin and Philip Morris.
L51v TIL Korobeiniki, widely known for being featured in Nintendo’s 1989 release of Tetris, is actually a traditional Russian folk song. More details in comments.
dDVBd TIL that not only can octopi change their color to match their surroundings, but they can also change the actual texture of their skin as well by controlling the size of projections on their skin (called papillae), creating textures ranging from small bumps to tall spikes.
VKb4 TIL - With 25 billion hours (2.85 million years) of total game play, people have played Call of Duty for longer than the course of human existence.