Scientists have created the first 3D model of the human conjunctiva — the clear, protective outer membrane of the eye — in the lab, and it even produces its own tears. The researchers say the new ...

Picture this: Your friend is crying, and you don’t know what to do. Do you immediately hand them a tissue? It’s Hoda Kotb’s first instinct, but she says there may be a reason to hold back. “Let me ...