Waves are hypnotic and beautiful. They can also be great fun. But Hurricanes Katrina and Rita taught us that they can be powerful and deadly while the 2004 tsunami proved that some waves are absolutely devastating. Science is the best tool for understanding and predicting the most extreme waves. Where do waves come from? Why are some big and some small? From winter to summer, the nature of the beach changes, sculpted by the tireless energy of waves...