01:42
Disappearing Species and the Endocrine System
Zoologist and World Wildlife Fund senior scientist Theo Colborn talks about the impact of environmental toxins on the endocrine systems of exposed animals. Dr. Colborn observes that some of the species being affected have been in existence for milli...
05:05
The Darwinian Revolution
Philosopher John Searle talks about what he considers to be the three primary contributions of Charles Darwin. At the time Darwin lived, Professor Searle explains, his most influential idea was that natural selection, rather than intelligent design,...