At the North American International Auto Show in Detroit this week, it's not all hybrids and battery-powered cars. Some car companies are making significant investments in a fuel that's not new at all — diesel.
The newest diesel engines are far cleaner than their predecessors, and they get many more miles per gallon. The question is, what's holding customers back from switching gas pumps?
When you look around the auto show, there's a lot of energy and there's a lot of money being spent again. The one topic that keeps coming up, of course, is fuel economy.
A group gathers in a Ballston, Va., home for a supper club organized through the site Feastly. A new food trend gaining popularity in New York and other cities lets diners enjoy a meal prepared by a stranger in that person's home.
Credit Courtesy of Noah Karesh
Glori Linares, left, and Victoria Delgado, invited strangers to a dinner party in their apartment in Brooklyn through the site EatWith.com.
The world's biggest trees, such as this large Scots pine in Spain's Sierra de Baza range, are also the world's fastest-growing trees, according to an analysis of 403 tree species spanning six continents.
Credit Asier Herrero / Nature
The General Sherman, a giant sequoia in California's Sequoia National Park, is more than 2,000 years old, and is thought to be the largest tree (by volume) in the world.
Like other animals and many living things, we humans grow when we're young and then stop growing once we mature. But trees, it turns out, are an exception to this general rule. In fact, scientists have discovered that trees grow faster the older they get.
Once trees reach a certain height, they do stop getting taller. So many foresters figured that tree growth — and girth — also slowed with age.