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TIL: “His Master’s Voice” was originally a painting by an artist of his later brother’s dog Nipper (so named because he’d nip people’s ankles). He also would listen intently to a recording of his dead master’s voice.

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rNJvy TIL that reindeer eyeballs turn blue in winter to help them see at lower light levels. (They're golden-colored in summer.) No other mammals are known to have this ability.
YpkjZ TIL sultans of the Ottoman Empire employed deaf servants, because silence played a key role in expressing majesty to subjects and visitors.
4kk86 TIL the energy released by turning just one kilogram of hydrogen into helium is the same as burning 20,000 metric tons of coal. The sun is doing this constantly through nuclear fusion.
Dbje TIL that a man planted 7,000 trees to make a guitar shaped forest as tribute to his late wife.
MZvB TIL that Tim Burton’s movie, “Mars Attacks” was inspired by an ultra violent trading card set made by pulp novel cover artist Norman Saunders. He made the move very true to the cards as well.