Everest is the tallest peak on the planet at 29,031 feet above sea level and because of that, every year it draws thousands of climbers who hope to add climbing it to their list of accolades. And while by now most have seen images of the trash left behind by climbers hoping to make it to the top, now experts say Everest hopefuls are leaving something else behind. Researchers from the University of Colorado Boulder gathered sediment samples from mount everest, one of the least hospitable places on Earth and found bacteria they weren’t expecting.