The sternum, or breastbone, is the flat bone where the ribs meet. Sometimes, the joints can pop or crack as a person stretches or moves. A muscle spasm, an injury, costochondritis, and surgery are ...

Shadow and Bone is a fantasy series based on a successful set of novels. There's a lot to take in — at least six main characters, people who can wield wind and shadow and light, and a Chosen One. That ...