A mysterious organ that’s most active in childhood might play a previously underappreciated role in adults. In a study of almost 2,300 adults who underwent chest surgery, removing the thymus gland was ...

The axolotl, a type of salamander that stays in the tadpole form throughout its life, is a master of regeneration. Axolotls have been observed to regrow several body parts, including limbs, eyes, and ...