As much as we would like to, we don't have all the answers.

Bone can heal itself, but not always in the ways we expect. Some animals regrow entire limbs. Others, like humans, can only manage a few millimeters at the tip of a finger. This wide range in ...

By Dr. Liji Thomas, MD By seamlessly tracking brain growth from the womb into early life, researchers uncover when key brain regions surge and how subtle sex differences emerge before birth. Study: ...