re: How do you explain the origin of the various human races scientifically?

I'm not skipping through 9 pages of thread but I have to ask, has "A Troublesome Inheritance" by Nicholas Wade been mentioned yet? I just finished it and I know there's been some pretty intense backlash from the scientific community but it offers some interesting insights on how we've continued to evolve and how we may one day become entirely separate species. It's a taboo subject in many circles but it really shouldn't be.