I would just like to point out that e.g. according to buddhist belief, where/how you are reborn depends on what you helped to create in your previous life.

this is to be understood both biologically and psychologically. i.e. when you hurt someone, like your neighbor, chances are high that you're going to experience the same action done to you in your next life, but also if you help somebody ofc.

so the chance of being reborn in africa if you live in the US today are ... low, i'd say.

I wonder where the data starts.

I mean technically each sperm/egg combo has the potential to become a human in some scenario.

Did they include each time someone knocks one out of the park on their own?