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Introducing a new video series—and an answer to the mother of all questions

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eWE5 TIL In 1967 Sweden switched from left-hand driving to right-hand driving. All vehicles had to come to a complete stop at 04:50, then carefully change to the right-hand side of the road and stop again before being allowed to proceed at 05:00
7rbjx TIL that the world's oldest prosthetic device, an artificial wooden toe was found on a 3,000-year-old mummy of an Egyptian woman in 1997. Now, researchers from the University of Basel in Switzerland have learned a great deal about how the toe functioned, what it's made of, and how it was fabricated.
QNZ1L TIL Debbie Reynolds was not a dancer when she made Singin' in the Rain (1952). Gene Kelly apparently insulted her for lacking dance experience. when Fred Astaire was in the studio, he found her crying under a piano. On hearing what had happened, Astaire volunteered to help her with her dancing.
epKJ4 TIL The F150 is the ninth most popular vehicle in the world, despite having virtually no sales outside the US. The only other American cars in the top ten are Teslas, which sell world-wide.
XG4k TIL That the danish Crown prince Frederik is a fully trained operative soldier of the danish Frømandskorps (The danish version of the american Navy SEALS).