Sound psychology experiment from Salford University to find out what makes a sound unpleasant. Although its experimental data collection phase is over, with much-publicized results that announced “the worst sound in the world,” it’s still online to try for fun and compare your tastes to others. Fingernails on a blackboard? Babies screaming? Dentist’s drill? The site also offers a mixer to play with, and if you want to torment your friends some sounds are available as free ringtones. (Dr. John Grohol Pick)