Screeeeeeeech. Even imagining the sound of a person's fingernails scraping down a chalkboard is horrible. Now, new research helps suggest why the noise is such a special kind of awful. The frequency ...

There are certain sounds that drive us batty. For many people, it's nails on a chalkboard. For me, it's the squeaking sound of styrofoam. What causes this reaction? —Brepark, via the Straight Dope ...