Population data typically comes in the context of boundaries. City data. County data. Country data. With their Population Estimate Service, NASA provides data at higher granularity. You can request estimated population in the context of a world grid.
World population estimator and gridded data from NASA
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Shifting Incomes for American Jobs
For various occupations, the difference between the person who makes the most and the one who makes the least can be significant.
When Americans Reach $100k in Savings
It was reported that 1 in 6 millennials have at least $100,000 saved. Is this right? It seems high. I looked at the data to find out and then at all of the age groups.