A lunar halo, or ring around the moon, is more frequently seen than other lunar sights. Learn what causes it and when to spot ...

Different apples taste differently and are good for different uses. There’s even some unique history to the names of ...

Learn the definition of wind energy, how it works, the different types of wind energy, pros and cons, and more.

If you follow a vegetarian or vegan diet, be aware that some foods that contain animal products might not be obvious, such as ...

Looking for a dog with an even temperament? These breeds are the most sweet, loving, and gentle with kids, families, any ...

The history of solar energy was one of fits and starts, driven by individual inventors and scientists. Discover major solar ...

A single flash of lightning contains an immense amount of energy. Learn exactly how much, plus whether lightning can be ...

From aeroponics to zero waste, Treehugger's comprehensive glossary of environmental words is your guide to sustainability lingo.