ELI5 Left Handed - why aren't 50% of people lefties?

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

Why aren't 50% of people lefties? Why are right handed scissors not usable by left handed folks? Why isn't everybody ambidextrous? Why are a disproportionate number of US presidents left handed?

... We explain like i'm five!

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Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: happyweeze, zodde, schorhr, deviousterran, llittle_llama, fox-mcleod, samzeman, mathem_ & howmanydads

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