Your body's made to run, to walk, to trek long distances and carry things, work in a forest, and hunt animals. You have to keep it alive to function.
I’m struck again by the irony that spaceflight-conceived in the cauldron of nationalist rivalries and hatreds-brings with it a stunning transnational vision. You spend even a little time contemplating the Earth from orbit and the most deeply engrained nationalisms begin to erode. They seem the squabbles of mites on a plum.