PERIODICALS
SCIENCE & TECHNOLOGY
write Zihlman, an anthropologist at the University of California, Santa Cruz, and Lowenstein, associate clinical professor of medicine at the University of California, San Francisco. It can tell researchers if a sus- pected human ancestor walked upright or on all fours. A tooth, on the other hand, can be deceiving; the teeth of the prehistoric chalicothere, for instance, led anthropologists to believe it was an ancestor of the horse until they discovered...