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So the astronauts could read the numbers, but could they do anything about them? I'm guessing that it is difficult to make manual actions with any precision while being subjected to that sort of vibration. Alternatively, if there was nothing they could do at that stage, did they need to read the numbers?

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Yes, in the experiment we had to touch highlighted groups of numbers on the screen during some phases, do simple math on groups of numbers, or read out numbers. One of the harder parts is repeatedly reaching out to touch the screen under G forces, your arms get really tired really fast.

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