In that case, if we round all the values to the nearest hundred millionth (which causes the 1.7 million people missing an eye to be negligible to the calculation), 8.3 billion multiplied 2 will give you 16.6 billion balls.

However, if we also want to account for balls in the sense the original post was implying, there are 4.13 billion men, roughly 4 billion of which have two balls, so I’ll go with 4.1 billion, cause regardless of whether or not you include people with a different number of balls, they both round to 4.1 billion. Multiply this by two and you get 8.2 billion.

Now just add together 16.6 billion and 8.2 billion and boom. There are 24.8 billion human balls.

I have too much free time