From NPR:
The Forces That Shaped A Young Charles Darwin
Listen Now [10 min 45 sec]Weekend Edition Sunday, February 1, 2009 · To honor Charles Darwin — born 200 years ago this month — Weekend Edition Sunday and the NPR science desk are launching a series called “Darwin 200.” In the first installment, Keith Thomson, author of The Young Charles Darwin, talks about his early influences.
Via Pharyngula.