Grand Canyon tightrope walk: Funambulist Nik Wallenda traversed a 1,500-foot gorge near the Grand Canyon on a 2-inch-thick steel cable on Sunday, carrying with him a 43-lb. pole. Why did he bring such a heavy pole?
Laos' controversial Xayaburi Dam could bring the Giant Catfish to extinction, as well as devastate the Mekong River's other fisheries. The challenge: How to build a dam that allows a 600-pound fish to swim up stream?
New research suggests that snails in Ireland and the Pyrenees share almost identical genetic material not found in British snails, suggesting the snails arrived in Ireland with southern European migrants.