There's a whole world of sound, called infrasound, that your ears can't pick up. Learn more, on this Moment of Science.
Do other animals besides humans cry? Find out on this Moment of Science.
Older and wiser has a special meaning when it comes to elephants, as we discuss in this Moment of Science.
After elephants, Nile hippos are the largest land animals, weighing up to eight or nine thousand pounds.But, unlike elephants, hippos spend their days in the water, which might make it seem silly to ask: can hippos swim?