The MIT Technology Review is a rich vein of science-ish knowledge into which you should tap. Unapologetically geeky, the focus is on the human significance of our interaction with the tools we create, the problems they solve and the meanings they propose.
Fingernails on a chalkboard? Nope. Rubbing a balloon? Uh-uh. Screeching tires? Not even. Researchers at the University of Newcastle in the U.K. have brutalised the eardrums of 16 subjects to try and find out what sound agitates humans the most.