On Sunday, October 28, 2018 at 3:55:30 PM UTC+1, John Clark wrote:
>
> We know experimentally that the inverse square law is true for distances 
> greater than 1 mm but at distances less than that it's too hard to measure 
> gravity to know what's going on.
>

Why is it too hard to measure gravity for distances less than 1 mm?

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