Pie charts are a way to show data. Pie charts show proportions of a whole. The circle of the pie chart represents the whole. That's a full 360 degrees. Each part, or slice, represents part of the ...

If you want to keep your brain in tip-top shape, then you need to exercise it just as regularly as you would the rest of your body. Admittedly, you can't exactly stick your brain on a treadmill, but ...