On April Fools' Day 1946 at 7:00 a.m., the ocean along the coast of Hilo and Laupahoehoe, Hawaii, began to recede in a way no one had seen before. Within minutes a rushing wave of water arrived, and then two more, each more powerful than the previous. Children who had been curious and were gathering up exposed sea creatures from the sand were washed away. In all 149 Hawaiian people were killed by the tsunami. There was no warning. As a result, the...