Life's Little Mysteries

When the pharaoh Tutankhamun died young, his widow may have tried to remain on the ancient Egyptian throne, ancient letters reveal.

Poisonous and venomous animals can kill, but their toxins are delivered different ways.

And what can happen to your body if you stay awake way past your bedtime?

Can a person or object exposed to high radioactivity just take a shower with soap and water, or is more needed for decontamination?

To the naked eye, the night sky reveals only one moon. But how many moons have ever orbited Earth?

Which living and extinct animals have the strongest bite forces on record?

Dogs commonly tilt their heads, but is it a sign of intelligence, or does it mean something else entirely?

Sand is difficult to walk or run across. But why?

The brain doesn't have its own pain receptors, so why do headaches hurt so much?

The bottom of the Mariana Trench is about 35,876 feet (10,935 meters) deep, making it deeper than Mount Everest is tall.

Not all asteroids are planet-killers — most are tiny and others are huge. So what are the largest and smallest asteroids in the solar system?

Animals, especially those on land, can't grow indefinitely. The reason has to do with the square-cube law.

Octopuses are odd: They have more than one heart and copper-rich blue blood.

Most young children can easily pick up languages and learn immense amounts of knowledge in their early years. How do they pull this off?

Did Alexander Graham Bell really invent the telephone, or did he steal someone else's thunder?

If humans suddenly disappeared and our pets had to fend for themselves, could dogs survive in a world without people?

In case those licks and wagging tail weren't convincing enough, scientists prove what we already know. Our dogs love us. They really, really love us.

You can't watch Earth spin in real time because it rotates so slowly, but there are ways to see the effects of the planet's rotation.

Do mice like eating cheese, or is it a myth?

During the last ice age, which route was taken by the first humans to reach the Americas, and did they travel by foot, boat or both?