The document discusses various facts about bones and their structure and function. It provides questions that direct the reader to different websites to learn that the femur is the longest bone, the skull protects the brain, and the three smallest bones in the ears are the malleus, incus, and stapes. Bone is made of living tissue called marrow that produces blood cells. Joints like the elbow, knee, and shoulder are hinge joints that allow bending and straightening like a door hinge. George Washington's teeth were made of ivory, not wood as some legends claim.