Life's Little Mysteries: Science questions, answered

Cats sometimes catch and leave a "gift" for their humans. But why do cats give us dead mice, birds or other prey?

Scientists have identified some reasons why yawns spread from person to person.

Cooking is an essential part of human culture, but people haven't always written down recipes the way we do now.

That second wave of energy is a normal part of the human circadian rhythm, but lifestyle factors also play a role.

Though research on sexual experience in nonhuman animals is limited to primates and rodents, there's reason to think that they have an "orgasm-like response" during sex.

Modern flight recorders can hold more than 1,000 pieces of information about an aircraft.

It's a story that involves scales, sloughs — and spectacles.

New discoveries challenge old ideas about the earliest alphabets.

Female kangaroos have one tail, two feet and three vaginas when they're giving birth.

Case reports of people with atypical brains reveal the human brain's staggering ability to adapt to damage.