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hi this is useless

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The first movie was invented one hundred years ago. Movie inventors dreamed of having 3D movies but weren't able to then.

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People had to use a stereoscope for the 3D effect. A stereoscope combined the two screens. Also people had to wear things that looked like goggles over there eyes.

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People watched the first 3D movie of a train and totally freaked out because it was so cool. Also the audience thought they were about to get run over.

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People started using real 3D glasses instead of ugly things that looked like goggles.

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The glasses had a blue lens and a red lens. All the glasses are a little bit different and bring a different image to every eye. These glasses are still around today.

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Using two screens could be a problem. This is because if one screen was a couple seconds off the people watching the movie will have a very blurry view. This gave the viewers a headache.

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People were able to fix the problem of two screens by printing the images one top of each other. This helped there only be one projector.

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https://youtu.be/BtVeUIy0GyA