Four years ago, we first heard about how Korean scientist had proposed using sound to charge mobile phones. They explained that it could be done via a piezoelectric effect, in which zinc oxide nanowires converted sound-caused vibrations into electricity. At the time, the researchers couldn't generate enough of a current to actually charge a phone. Now, however, scientists from Nokia and Queen Mary University of London (QMUL) have succeeded in doing so. Read More Charging a phone with sound would be useful for people who are noisy like some college students who throw a lot of parties at their Frat house, or dorms.