>"Who We Are and How We Got Here" by David Reich

IMHO, I'd take the conclusions offered here with a grain of salt. It's applying statistical methods to very improbable events (ancient bones surviving with DNA) to determine other very improbable events (evolutionary DNA change). The conclusions at least somewhat rest on the assumption that those two things have relatively consistent probabilities. That could be true but it's probably not and if it's not it's somewhat unclear how that would bias the results that the book draws its conclusions from.