It is strange how many completely arbitrary and unproven numbers we live by:
10k Steps
The BMI
2000 Calories
6 inch Penises
8 Glasses of Water
8 Hours of Sleep
8 Spiders A Year
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@RickiTarr also the 5 a day thing for fruit and veg...
And 40 work week...
@quixoticgeek Oh lord I wish we could get rid of the idea that more hours equal more productivity, people seem to cling to it even though all research disagrees