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- Did a massive eruption spur Christianity in Iceland?
- On the trail of treasure in the Rocky Mountains
- Comment: The changing shape of local climates
- Dividing line: The past, present and future of the 100th Meridian
- Benchmarks: December 26, 2004: Indian Ocean tsunami strikes
- The geology of Middle-earth
- Down to Earth: With highway paleontologist Shane Tucker
- The question of mantle plumes
- The first Americans: How and when were the Americas populated?
- Benchmarks: March 17, 1944: The most recent eruption of Mount Vesuvius