A peek at the pre-Inca Chachapoya people. Arabs' philosophical roots found in ancient Iranian values. Ancient craters may have been traps for large animals. American Indian Painted Rock attracts modern scribblers. We got rid of those 2,000-pound Steller Sea Lions by eating their fish.
Radio transmitters help track snakes.
Australia's Fairy Penguins are set for winter oil spills with new sweaters. Biologists unleash a voracious beetle to chew its way through the US southwest. US scientists praise Peruvian national park. The largest structure ever built by living things may be younger than we thought. You've got mail from Mars.