CNN Chief Medical Correspondent Dr. Sanjay Gupta watches a brain-computer interface in action and explores the technology that is allowing humans to control computers using only the neural activity in their brains. https://cnn.it/3wGsDet | CNN

CNN Chief Medical Correspondent Dr. Sanjay Gupta’s new book, 'Keep Sharp,' offers insights from top scientists all over the world on how to keep your brain young, healthy, and sharp. What questions do you have for him? | CNN