ELI5 Bank Runs - why does a run on the bank happen?

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

What is a run on the bank? Why it can happen in a fractional reserve banking system? What’s the best thing to do when there’s a bank run? When was the first bank run? Can we prevent bank runs?

... we explain like I'm five

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