My go to gross space fact: astronauts shed the calluses on the bottom of their feet after a few months in space! 🧑‍🚀 One day when they pull off their sock, there it goes. The tough skin on the bottom of our feet is no accident! It forms because our feet are constantly pushing against the floor as we walk in Earth’s gravity. But in microgravity, our feet don’t need this tough skin any more. In fact, the tops of astronaut feet often develop tougher skin because astronauts are often hooking their