How physics will make earphones less painful

As most people know, a few hours of having an ear bud in their ear leaves them sore and unable to listen any longer. Scientists have figured out what happens during 'listener fatique,' and designed pump-action ear buds that can solve the problem. Find out how you can rock and roll all night, and party every day. » 5/13/11 8:30am 5/13/11 8:30am