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- On the trail of treasure in the Rocky Mountains
- New measurement shakes up earthquake estimates
- Science as a family affair
- Ocean tide size linked to supercontinent cycle
- Benchmarks: May 8, 1902: The deadly eruption of Mount Pelée
- Benchmarks: March 17, 1944: The most recent eruption of Mount Vesuvius
- The first Americans: How and when were the Americas populated?
- Dividing line: The past, present and future of the 100th Meridian
- Benchmarks: September 6, 1869: Pennsylvania's Avondale coal mine fire kills 110, igniting reform
- When and how did plate tectonics begin on Earth?