We saw a similar video of boundary development over the centuries before, but I like this one as a contrast to it. The first is really default-looking, whereas this one has a little bit of production value.
US boundary evolution
Projects by Nathan Yau See All →
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.