1.   The human spine tapers off at its base.

2.   Chiropractors manipulate the human spine in the belief that this treatment can relieve medical complaints.

3.   Pieces of a skull lay nearby, a leg bone and a human spine poked out of the earth.

4.   One of the investigators is shown in APTV footage holding a bone he says is from a human spine.

5.   One of the researchers was shown holding what he said was part of a human spine.