"Using high speed cameras, it’s possible to record the vibrations of everyday objects caused by nearby sounds and reverse engineer the sounds…essentially turning anything that vibrates into a speaker. For instance, if you want to know what a person is saying but can’t hear them directly, you can take a video of the house plant next to them and recover the sound from the micro-vibrations of the leaves. In one example, they filmed a pair of Apple earbuds playing a song and the recovered audio was accurate enough for the Shazam app to identify the song."