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TIL when snowflakes hit water they create a screeching sound too high for humans (but not some sea animals) to hear. When a flake hits the water, an air bubble is released that oscillates in the 50-200 khz range well above a human's range. Snow hitting water can increase underwater sound by 30 db.

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gMNBL TIL that in thanks to Benjamin Franklin, all electrical diagrams (at least in the U.S.) are technically backwards (in terms of electron flow/direction). He assumed the flow of electricity originated from the positive terminal of a current source, and traveled to the negative terminal.
MeQY7 TIL Natalie Portman, who played Queen Padme Amidala in Star Wars: Episode I- The Phantom Menace, skipped the premiere so she could study for her high school finals.
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