Few and far between, maybe 1% of 1% of 1%... but they're out there. So, one or two kids in every district, or a 10% chance of one kid in any one school. Where'd I get these stats? Thin air.
http://www.ebony.com/career-finance/mos-bows-bowties-099#axz...
...I think we went to very different schools...
That having been said, this could make for a really interesting and thought-provoking pen-pal-type program. In particular, the visualizations relating to personal interactions or how time is spent could really highlight cultural differences that we're usually oblivious to.