How good is your hearing? Take a hearing test to determine the range of frequencies that you, other humans, and other animals can hear.

Explains how the brain is able to understand sounds and speech. Aired May 29, 2009 [12:27]

We'll talk about research into how people hear, from the tiny hair cells within the ear, to the body's ways of dealing with loud noises.

Three sound files provide an opportunity to hear a single wolf howl, a wolf pack howl and the wolf pack howl of both the adults and the young. Requires QuickTime.

This gifted pianist associates a specific color for every musical note. Known as synesthesia, this rare condition is only apparent in one person out of several thousand. Read this cover story and discover more about this interesting...