the tissue in the middle of bones that creates red and white blood cells.
http://en.wikipedia.org/wiki/Bone_marrowA transplant is what happens when doctors take a body part from one person and give it to another person, kind of like Frankenstein except not so scary-looking. Scientists are hard at work on some of the most difficult parts to transplant like hands and faces.
Lindsey O'Connell
Have you ever seen fossil remains of dinosaur and ancient human bones in textbooks, television, or in person at a museum? It's easy to look at these and think of bones as dry, dead sticks in your body, but this couldn't be further from the truth. Bones are made of active, living cells that are busy growing, repairing themselves, and communicating with other parts of the body. Lets take a closer look at what your bones do and how they do it.
