Meet a real live man who changed history with a totally new way of identifying you. Plus a four hundred-year trip through 20 locations. Swedish electricity and Dutch wind tunnels use a new type of photography. Aristocratic World War I fighter aces and their crazy mountain-climbing uncles. Touchy-feely times in Romantic Germany. The mysteries of ancient cities uncovered. Female painters in eighteenth-century London theaters lit by amazing new kinds of lights. Saving sailors from shipwreck and helping Caribbean smugglers. Astronomers, poets, fishermen, mathematicians and skeptics, bird-painters and Russian skullduggery lead the program to a final beauty-spot, where hundreds of Americans get drenched every day.