If you want to open an actual door to the past, you’ll have to do it without a doorknob. The patent for the a knob that turns to move a latch inside the door wasn't filed until 1878. Lots of things, from CPR to timezones to sliced bread, that seem like they've been around forever are actually quite young.

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Music by Kevin MacLeod.

Links to all the research resources are on the website.

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