Playing doesn't end with childhood. It's important for adults too, just in a different way.

It wasn’t until a few years ago that researchers defined what really counts, to animals, as play.

In place of brick, builders are embracing new materials and wood-frame construction. The reasons why come down to changing economic, cultural and environmental dynamics.

Among the telltale signs are: questionable judgment; willingness to take on backbreaking labor; inability to delegate tasks. And stress, lots of stress.

The inefficiencies of steam have gone unchecked for years. But now, that may change. Earlier this year, New York City passed a landmark law to reduce greenhouse-gas emissions

Tropical Storm Allison ravaged Houston’s Texas Medical Center in 2001. Sixteen years of storm-proofing followed, before Hurricane Harvey made landfall.

Using desert-taming techniques the ancients mastered, a region of Israel sees vineyards flourish.

Where one Canadian team works, there are rugged mountain peaks, foothills and vast meadows, as well as towns and farmland. How many bears live here? 

Nostalgia means everything old can be new again. In the brain, memory meets emotion to make us feel good (mostly) — and sometimes like spending money.

Science has largely debunked the idea that the moon influences our behavior — but recent research is questioning that modern wisdom.

Horseshoe crabs breed along North America’s eastern coast, from Maine to Mexico. And every year, tens of thousands of them hook up on the beaches of Delaware and New Jersey.

Where were you on that day in July 1969? A lot of people watched, and say it changed their lives.

If you want to own a plot of lunar land, there are websites that will sell you one. Are those websites for real?

Short answer: money

TV and movies represent everything that’s wrong about physical education. Some teachers are working to change that.