- Why scientific theories can’t be proved absolutely
- Why can't science answer our question about God?
- Could we survive the trip to another planet?
- Life after death: is proof possible?
- Life: a miracle or a chemical reaction?
- The problems of colonizing another planet
- How certain are proven facts?
- What's really scary isn't Halloween
- a scientific theory examined
- beyond earth
- Great Ideas
- how do we know that?
- humans, primates, and other life on earth
- in the last 10,000 years or so
- Questions beyond Science
- saving our home – thoughts about global warming
- science and religion
- something new about something old