Samuel Preston of the School of Arts and Sciences comments on the decrease in the birthrate among teenagers during a time of economic trouble.
School of Arts & Sciences
Ross Koppel of the School of Arts and Sciences comments on the accuracy of electronic health data.
PHILADELPHIA -- A new mathematical model developed by researchers at the University of Pennsylvania has offered even more evidence of the correctness of evolutionary theory.
Herbert Wilf, Penn’s Thomas A. Scott Emeritus Professor of Mathematics, and Warren Ewens, emeritus professor of biology, say their model directly challenges the long-standing contention among some doubters that evolution couldn't have happened because the small changes in species outlined by the theory simply would have taken too much time to be completed.