Human bones have a hard outer layer made of condensed bone and a softer inner core of spongy bone. This landscape of blue, red, and gold is a cross section through a developing human bone. Human bones ...

Despite their solid appearance, bones contain a spongy inner layer that absorbs shock so bones don't break during high-impact activities. Teeth are the hardest substance in the human body—even ...

Multiple myeloma is a kind of blood cancer that starts in plasma cells. Inside most of your bones is a soft, spongy tissue called bone marrow. Here, your body makes hundreds of thousands of red ...