Wisdom in old age depends on a fresh supply of new brain cells, a study in mice suggests.. When mature mice learn a new task, their newly generated brain cells are three times more active than their old ones, the researchers found. The findings add to a growing body of evidence that the adult brain needs a steady addition of new cells to maintain its mental faculties. Researchers found that mature mice’s brain cells are much more active than before when
A. they are transplanted with new brain cells. B. they learn to do something new. C. they gain weight in the body. D. they get new cells from other mic