Life's Little Mysteries

Here's a look at the research about whether left-handed people are smarter than righties.

About 4.5 billion years ago, the solar system was just a giant, spinning cloud of gas and dust. Today, it's flat. Here's how that happened.

You have two nostrils, but usually one is dominant.

Archaeologists know of three sites in East Africa that date back to millions of years ago.

Here's how long a "moon day" is.

Here's why some Maya city states fell about 1,000 years ago.

Some animals, such as poison dart frogs, carry enough toxic chemicals to kill multiple adult humans, but they've evolved tricks to avoid poisoning themselves.

Of all the colors we can see in nature, blue is one of the rarest.

Here's how alcohol can help preserve DNA, tissue samples and even entire organisms.

Grinding our teeth damages them, so why do we do it?

Dogs regularly wag their tails to greet humans and other dogs, but what about their wild counterparts? Do wolves wag their tails?

These planets are mostly made of gas, but a spaceship would have a rough time trying to get through a giant planet like Jupiter or Saturn.

Humanity is feeling the effects of climate change around the world, but could climate change make humans go extinct?

The aging process doesn't happen equally on both sides, leaving the human face increasingly less symmetrical with age.

The cheetah is often called the world's fastest animal. But is that true?

Here's how the idea of a "mummy's curse" got started.

Scientists have figured out the average color of the universe by recording visible light from more than 200,000 galaxies.

Why do people sometimes gain weight after they start to exercise regularly?