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Gupta, always good to see you. if you d like to find out more about your sunscreen brand, and whether it s effective, go to ewg.org. all right, so-called big foot sights and an emergency call to 911. the rest of the story straight ahead. but first, you gym enthusiasts out there, can finally get a light aerobic workout while at work. but you have to stand up to do it. it s a new invention called the track desk and it combines a desk with a piece of gym equipment. gary tuchman has this edge of discovery report. reporter: david lee walks 25 miles a week without even leaving his office. it s quite comfortable just to walk all day long. reporter: lee owns a trek desk, a height adjustable work station designed to fit over a treadmill. it allows users to type, talk and think on their feet. and when people come up and see it initially their reaction ....