Space Suits
Early space suits used umbilicals, but modern designs carry their own temperature/humidity control, air supply and electric batteries.
Read more about this topic: Umbilical Cable
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“But alas! I never could keep a promise. I do not blame myself for this weakness, because the fault must lie in my physical organization. It is likely that such a very liberal amount of space was given to the organ which enables me to make promises, that the organ which should enable me to keep them was crowded out. But I grieve not. I like no half-way things. I had rather have one faculty nobly developed than two faculties of mere ordinary capacity.”
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