Astronauts and people on bed rest can experience gradual bone loss that increases their risk of fracturing a bone. Here's why.
At this very second, cells in your body are replacing themselves. Maybe your muscle cells, maybe your bone cells, or maybe even both. First, how do they do it? Learn more on this Moment of Science.
Did you know that broken bones start to fix themselves almost immediately after they break? Learn about broken bones on this Moment of Science.