Bones in Balance
Thirty-first monthly installment of our "What A Year!" website project, introducing life science breakthroughs to middle and high school students and their teachers. Our bones change throughout our lives, building and increasing in density to our 30's and then decreasing in density thereafter. People who don't get exercise, such as those who must remain in bed for long periods of time, can suffer early osteoporosis. But why don't bears, who hibernate for half a year, experience the same problem?