Humanity never had a "missing link" to apes

Our early human ancestors began to walk on two legs a couple of million years ago, abandoning their old life of swinging between tree branches and perching in the leafy forest canopies of Africa. Now, a new study suggests that this transition from the trees to the ground was a long one. It appears that our ancestor … » 10/25/12 1:00pm 10/25/12 1:00pm