Incredible But True Incredible But True Human World History Makers Cities Of The World Art And Music Sporting Headlines Plant Life Fish, Amphibians, Reptiles Birds and Mammals Creepy Crawlies Marine Life Restless Earth Earth's Secrets Changing Weather Seas And Oceans Comparisons Amazing Structures Machines And Man World Of Inventions Travelling Around Mysterious Universe	Unlikely Cure In the 15th century, invalids were often dressed in red because it was believed this made them recover more quickly.   Previous: Back Book: Incredible But True Section: Incredible But True Chapter: Human World