; ; Dr. Wake talks about the state of planet from the viewpoint of Amphibians. What can they tell us about the importance of biodiversity?; Further reading: Scientific American, vol.272, no.4 (1995) pp. 52-57
Dr. Morrison's lecture describes how NASA proposes to protect Earth from asteroid collisions. He also discusses how these collisions might effect evolution on Earth.
Keith Thomson talks about Jefferson's scientific thoughts and his personal battle with the french Count Buffon. In 1796, Jefferson received a letter announcing a discovery of bones of a large animal (the giant sloth).
