Everyone knows about arc lights – well, let me say that if you work with light, you know about arc lights. Sir Humphry Davy gave birth (not literally, obviously) to the first arc light back somewhere between 1802 and 1809. An excellent nerd and science man, Bill Gurstelle, made a video on how to create a little arc light – check it out!
By the way – if you’ve never read up on Humphry Davy, I highly recommend just checking out his wikipedia entry. He had a really well-known assistant, Michael Faraday, who also went on to contribute to the way we think about electricity today.