What causes stress? What does it do to our bodies? What’s the difference between 'fight or flight' and 'rest and digest'? Does stress cause grey hair?

 

... We explain like i'm five!

 

Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: 4dddyq, windystew & penakazato

 

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