courtesy of GULL Japan Somewhere in a distant past, a bearded ancestor dressed in deer skins was scraping oysters (yum!) off a rock when his rotten knife fell into the sea. The knife whirled to somewhere in the bottom. Only by jumping in the water could he recover it. Was it the only equipment he needs for survival in the water? Was the sea 130 feet deep? Was he actually risking his life for that depth? The question remains but the answer lies somewhere between when the dinos