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Because of their unique training and understanding of the relationship between the health of all species, veterinarians can be found playing many unusual and surprising roles. Some veterinarians even serve as astronauts, working with other researchers to study what happens to people and animals in space where there is no gravity. They perform experiments on Earth and on space shuttle missions in order to observe the long-term health effects of space travel and a zero-gravity environment on experiments with animals. This kind of research has led to improved lifestyles of astronauts during subsequent space missions and continues to provide new information for future human life in space.