As brains age, they slowly lose the ability to generate new neurons, which results in a diminishing ability to learn new things and retain memories. But today a group of neuroscientists in Florida announced a strange cure for what amounts to brain decay: blood from the umbilical cords of human infants. When the researchers injected this blood into aging rats, it kickstarted a new round of neurogenesis in their brains, helping them to grow new neurons and shed some other effects of brain aging. Essentially, effects of aging were rolled back. There’s tremendous potential here for helping aging humans to regain the plasticity of their youthful minds.