The first slight knowledge of the more than 1,550 bits of fossil，representing at least 15 individuals，came from cavers helping a researcher to look for ancient remains.One place leading to the fossil room is just over seven inches wide—less than the width of a sheet of notebook paper.It took a team including six female scientists，chosen for their small size and research experience，to get the fossils. The scientists believe that the bodies were deliberately placed in the cave.It suggests that ancient long-ago human relatives became involved in ritual disposals of their dead.