"We've also got these big tanks full of oxygen and nitrogen, which are mixed to make air, and also water, so that we can provide everything that the astronauts need in the crew module to keep them alive on their journey."
Each finger in its latest hand has four independently controlled joints, which allows intricate movements.
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They've even dealt with a blood clot in the neck, treating it with injections of a blood-thinning drug and later oral medicine, once it arrived on a cargo resupply ship.