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The Apollo spacecraft would not be improved by adding a cup holder. You can't use cups to drink liquid in space. You don't want to drink before launch, you'd probably vomit it up. There's not much room in the capsule, so it would have to be retractable; then it would never be swung out and used. But it would have to be highly engineered, and tested, so it would add to the cost of the project, for no good purpose.
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