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Michael Mosley discovers the Cymothoa exigua (the tongue-eating louse) which becomes a functioning part of its host. Subscribe to Earth Science: http://bit.ly/SubscribeToEarthLab Best videos http://bit.ly/EarthLabOriginals The Doctors Are In The House http://bit.ly/TheDoctorsAreInTheHouse Infested: Living With Parasites Found in almost every animal on earth, the connection between parasite and host is everywhere in nature. To reveal how this relationship works for both of us, Michael Mosley is going to systematically infect himself with six of the most extraordinary, powerful and surprising parasites of all. Welcome to BBC Earth Science! Here we answer all your curious questions about science in the world around you. If there’s a question you have that we haven’t yet answered let us know in the comments.