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stunt devils are used in certain scenes of a movie so actors wont get hurt

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People who perform in plays or musicals rehearse before the actual showing.

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Testing the side effects of medications to volunteers

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missile operators simulate missile shots to assure they hit their targets

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They test monkeys and dogs in space before sending people

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Astronauts go through simulations to prepare for space travel

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Apple drop their new iPhone, to see if they will survive the drop

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Tank operators use million dollar simulations to train

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x box and playstation game consoles make game simulations before you buy them

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Astronauts training with simulations in order to learn how to survive and uphold a mission in a spacecraft

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a battle plan for war

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dirt bike racers see the track on a monitor  before racing on it

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testing toughness of cell phones before releases to the consumers

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football helmets use simulations when testing the helmet for safety

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Scientists test vaccines on animals to see if they are safe or have side effects

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rollercoaster simulation:
rollercoasters are tested with dummies to ensure that no one is injured or killed

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Giving volunteers different types of medication to test side effects, and in return they are paid.

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astronauts do simulations to see how situations would be in outer space

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Doctors use simulations with lab rats to study the potential side effects with new medicines.