I appreciate this point. In a similar vein, DNA services like 23andMe should also come with dates on them. In fact, frankly, any mention of ethnicity should com

I appreciate this point. In a similar vein, DNA services like 23andMe should also come with dates on them. In fact, frankly, any mention of ethnicity should come with a date. No cultural group–bound by genes of memes–is truly the same river twice.