Brain cells don't need to be in your head in order to learn something, a new study suggests. The results show brain cells living in a lab dish can be taught to keep time. The neurons, relocated from the outer layer of a rat brain to the inside of a lab dish, could fire for specific amounts of time depending on how they were trained. The findings shed light on a puzzle scientists are still grappling with - exactly how the brain tells time. Much of what humans do in their everyday lives relies on the brain's ability to perceive...