I made an app that synchronizes audio sources within a fraction of a hertz. One use case is a "flash concert" where a hundred cell phones play the same thing at once, with a surprisingly powerful effect. Another is electroacoustic manipulation, like levitating megaliths, or agitating plasma to create voltage from an open fire source.

Day two, who is Jon Galt?

I got it from 9gag don't try to Gotcha me!