The word zeitgeber describes natural phenomena that help us regulate our internal clocks. It refers to things like the daily cycling of night and day, the gradual cooling off of the day's temperatures ...

It’s been a long time coming after such a cold and snowy winter — one of the most brutal in years, but spring has finally arrived on our doorsteps. Friday was the first official day of spring, the new ...

Spring arrived officially at 10:46 a.m. Philadelphia time Friday, the instant when the sun beamed its most direct light on the equator. But whether the atmosphere is prepared to accept that ...

Once established, azaleas are easy-to-grow shrubs that announce spring has arrived with their colorful blooms. That's why, after years of a spectacular show, it's so frustrating when your azaleas ...