One Potato, Two Potato: Numbers and the Mind. Why are some people math whizzes while others are scared to do simple arithmetic without a calculator? This week we explore differences in math ability; new and old debates on math education (remember "The New Math?"); the link between autism and skills in rapid-fire calculation; and Hollywood's fascination with brilliant, troubled mathematicians. Plus a trip to AT&T's research labs and some of the best minds working in mathematics today. Guests include Brian Butterworth, Professor of Cognitive Neuropsychology in the Institute of Cognitive Neuroscience at University College in London; Keith Devlin, executive director of The Center for the Study of Language and Information at Stanford University; Jeremy Kilpatrick, professor of mathematics education at the University of Georgia; Gary Mesibov, professor of psychology at The University of North Carolina; Jerry Newport; and AT&T mathematics researchers David Applegate and Jeff Lagarius.