Yet, as you get closer to humans on the evolutionary tree, tails disappear ... Just look at a human spine. You can see how the last few bones are partially fused together. That's your tailbone ...

Researchers have used distinct markers from human subpopulations to trace back to our common African root in a giant human "tree." However, a “trellis” model might be more appropriate.

The human spine has been transformed into a weight bearing column, putting it under unprecedented stresses and dooming us to the likelihood of back injuries and pain. As remarkable as our ...