Life's Little Mysteries: Science questions, answered

The causes range from innocuous media exposure to severe mental illness.

Hair shedding is normal, but when is it considered "hair loss"?

Are snorers immune to the sounds of their own snores?

There are many mysteries surrounding Europe's hunter-gatherers, but farming played a role in their demise.

The prize for the smallest animal goes to a group of microscopic species.

Do some species have instincts, or are these behaviors learned?

Earth's mass took hundreds of years to estimate, and even now, experts don't agree on the exact number.

The location of the solar system's outer boundary is a point of contention among astronomers. There are three possible candidates, which "all have merit." But which one is best?

The nuclear bombs dropped on Hiroshima and Nagasaki at the end of WWII left shadows of people on the ground and buildings. Here's why.

Sea levels were extraordinarily high during the last period of the dinosaur age. But ocean levels may have been even higher before that.