Tough job requirements

"They had to have a master's degree or Ph.D. in paleontology, archaeology or an associated field. They had to be experienced cavers. And they had to be able to fit through a 7-inch-wide (18-centimeter-wide) choke point in the passage leading to the chamber."

An all-woman team of spelunking scientists has retrieved hundreds of fossils from a 100-foot-deep (30-meter-deep) cave in South Africa — including the cranium from what appears to be a prehistoric humanlike creature.