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Not to be pedantic, but I think your example is a little off the mark. Red hair isn't evenly distributed amongst all human populations. [1] A heatmap of population that would leave out most of China and India isn't quite a heatmap of population.

[1] https://en.wikipedia.org/wiki/Red_hair



Ok, talking US maps. Not many per-person maps that would work worldwide. What do you suggest for an example?


Dark brown hair?


Unless you're counting hair dye, this will still leave out nearly 100% of China and India. You want brown eyes, or black hair.

Grain consumption levels should track population pretty well across the world.


Grain consumption will vary by local industry. Livestock and biofuels consume more than humans do.


Human height




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