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It sounds like the plot of a sci-fi thriller: A few months into their journey to Mars, a crew of astronauts realizes that something is wrong. They can't think straight. They keep forgetting things. They feel anxious all the time. They are slowly losing their minds — and the longer they are in space, the worse it gets.When we think about the risks of a trip to Mars, we usually think about engineering failures: equipment malfunctions, fires, explosions. But there are also biological hazards, unique risks associated with exposing the human body to the low gravity and elevated radiation environment of space.