Witness a mountain climber's terrifying 100-foot fall from his…

Mountain climber Mark Roberts was climbing Snowdon, the highest mountain in Wales, last month when a piece of ice fell from above, causing him to tumble 100 feet down the slope. He happened to capture the entire thing on his helmet camera. » 3/14/13 8:20am 3/14/13 8:20am

The Rough Guide to Solar System Mountaineering

The great challenge for any climber is to conquer each continent's tallest mountain. But tomorrow's climbers can consider a far more extreme challenge: leaving Earth to climb the tallest peaks of the solar system. Here's how they'll do it. » 10/01/10 9:30am 10/01/10 9:30am