When I was 13 I went to an adventure island off the coast of Scotland. We climbed mountains, fished, and were taught survival techniques. The big challenge of the trip was to be abandoned on a small island for a night with nothing but a pair of billy cans, a lighter, a plastic sheet, and some flares in case of emergency. My friend and I made our bivouac and then went in search of food. Dinner was to be heather tea and limpets. Limpets are large volcano shaped mollusks attached to rocks. To get them off the rock you have to pull them off quick (sometimes by kicking them). If you fail to remove it on the first tug, you'll never get it off. This is because they tighten their grip on the rock with their teeth and those teeth are the strongest natural material in the world: Their tiny, millimeter-long teeth are now the record holders for the world's strongest natural material, according to findings published in the Journal of the Royal Society Interface ...