This is Question 2 from EVO: Ten Questions Everyone Should Ask about Evolution.   If you like this free sample, how ’bout buying the DVD which contains all ten questions and  lots of extras.  You might also consider the EVO: Teachers Guide by Rodger Bybee and John Feldman.

In this brief portrait of Charles Darwin, Frank Sulloway helps us trace both the physical and mental journey that led Darwin to the idea that all organisms have evolved from a single common ancestor through natural selection.