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TIL mines around Spruce Pine, North Carolina are the source of the world's purest form of silicon sand. A series of geological processes that occurred 350m years ago caused the silicon to form almost without impurities. It is highly sought after and is probably in the device you are reading this on.

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via reddit.com

VMDND TIL that the Disney film Tangled (2010) is one of the most expensive movies of all time, which is unusual for an animated film. This is often attributed to the complexity in animating Rapunzel’s hair, however others point to the copious reworking in its troubled 14-year development period.
woL7Y TIL most US commercial radio stations east of the Mississippi river start with the letter 'W' and west start with the letter 'K'. By law, these call signs must be announced at every top of the hour.
7Ejx TIL the longest prison sentence ever given was 384,912 years long for failing to deliver mail.
4k88o TIL when the United States officially transitioned from analog to digital television on June 12, 2009, "1.75 million Americans were still not ready" resulting in 317,450 calls to the FCC on June 13. Coupons from the Dept. of Commerce were given out, to be exchanged for DTV Converter Boxes.
mxGLp TIL that the Snowbirds less than 6ft apart from each other during formation. That’s closer than we are currently allowed with physical distancing guidelines.