The azhdarchid group of pterosaurs were some of the largest animals ever to fly. The giant reptiles lived between 66 million and 225 million years ago, and their unusual proportions—big heads at the ...

It's no coincidence that our bodies feel a little creakier as we age. The trillions of cells that make up our skeleton age too, and some change in ways that weaken the very structure of our bones.

You might want to bring your dumbbells on that next spaceflight. During space missions lasting six months or longer, astronauts can experience bone loss equivalent to two decades of aging. A year of ...

The tibia, also called the shin bone, is one of the two bones in your lower leg. It’s the second-longest bone in your body after your thigh bone. The tibia is paired with a shorter leg bone called the ...