Horrible Histories is a fascinating series of books for children, covering all such niceties as the Rotten Romans, the Savage Stone Age, and of course the err... Awful Egyptians. With over 20 million copies sold, the series was that much a success, that the CBBC turned it into into a series, which might just be even more horribly original than the books. The Tudors and Victorians were that popular they got their own theatre show and the Ruthless Romans made it into a computer game, available for PC, Wii and Nintendo. And then there's the Terrible Treasures game online, which enlightens us by teaching us some facts of great importance: the Romans used a sponge as toilet paper, a bad hair day is solved by fresh gladiator's blood and mashed mouse brains make excellent toothpaste. And it's all really true (says the talking rat).