those 30 cycles per second sound waves are down there where a lot of hip hop and rap have their bass and kick drum frequencies. so next time you pull up to the stop light and the car next to you has that earth-shaking, intestine-drattling, door-bulging sound emanating, don't assume it's going to be a carload of heavily tatooed kids. might be one of us parkies improving our motor responses by getting down with a loud dose of Kanye West or Jay-Z.

jon