Size of the Universe
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If We All Left to “Go Back Where We Came From”
Imagine that those with immigrants in their family tree left the country. Almost everyone, basically.
Peak Non-Creepy Dating Pool
Based on the “half-your-age-plus-seven” rule, the range of people you can date expands with age. Combine that with population counts and demographics, and you can find when your non-creepy dating pool peaks.