Dr. Gina Semprebon, Chairman of the Science and Mathematics departments at Bay Path College, holds a skull made from the mold of "Lucy," which was found in Ethiopia in 1974 and is said to be 3.2 million years old.
( Courant Photo by Stephen Dunn )
We've upgraded our reader commenting system. Learn more about the new features.
The Baltimore Sun encourages civil dialogue related to our stories; you must register and log-in to our site in order to participate. We reserve the right to remove any user and to delete comments that violate our Terms of Service. By commenting, you agree to these terms. Please flag inappropriate comments.