The world's greatest scientists have long puzzled over the nature of light. Its incredible speed, mysterious frequency, relationship to color, form of travel, and uncanny ability to reflect, refract, diffract, and be absorbed altogether make light the ever-elusive quarry of science's greatest hunters of knowledge and understanding. This is the engaging account of their research and breakthroughs, their conclusive insights and ongoing questions, enhanced by full-color photographs and explanatory visual aids.