Sure, California has a state song (“I Love You, California”), a state flower (the poppy), a state bird (California quail). Those are all well and good, but the Golden State might soon become the first ...

Your body produces it when your skin is in the sun or when you eat vitamin-D-rich foods. It can be hard to notice a vitamin D deficiency because it sometimes yields no symptoms. One study found ...

And both uphill and downhill training can improve your proprioception — or your sense of where your body is in space — which can reduce your risk of falls. Start by charging uphill while ...