ELI5 Swimming - why are there exactly 4 strokes?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why are there exactly four strokes in swimming? Why are the Native Americans credited with the invention of Front Crawl and why is it also called the Australian Crawl? How did Butterfly come about as a variation of breaststroke? When was the dolphin kick invented?

... we explain like I'm five

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