View full lesson: http://ed.ted.com/lessons/how-tsunamis-work-alex-gendler The immense swell of a tsunami can grow up to 100 feet, hitting speeds over 500 mph -- a treacherous combination for anyone or anything in its path. Alex Gendler details the causes of these towering terrors and explains how scientists are seeking to reduce their destruction in the future. Lesson by Alex Gendler, animation by Augenblick Studios.