Scientists pinpoint the brain's internal mileage clock

Victoria GillScience correspondent, BBC NewsGetty ImagesScientists have for the first time located the "mileage clock" inside a brain - by recording the brain activity of running rats.Letting them loose inside a small, rat-sized arena, the researchers recorded from a part of their brains that is known to be important in navigation and memory.They found that cells there "fired" in a pattern that looked like a…