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

Didn't read this entier thread as it looks like it turned into a creationism vs. evolution debate.

I think the main thing the OP is missing, is that the evolutionary process takes many thousands of years to create these different races. only in the last few thousand years have we been able to travel enough to have different races interact with each other. The groups were isolated from each other for very long periods of time. And if you see what happened in the Galapgos Islands, you'll realize that people in one location are going to develop traits that are very different from people in another.