As soon as it gets dark, two bright lights become visible—the brightest in the southwest and an almost-as-bright light in the east. What are they?

A little-known chapter of the Hubble Space Telescope’s history is a reminder of the risks of looking at the sun ...

Spending time basking in the sun may be more ... And as the morning light emerges, melatonin levels decrease. Serotonin levels increase when you're exposed to bright light -- a major reason ...