Scientists in Tokyo have figured out a way to use acoustic sounds to levitate objects in air. To be more specific, they’re using ultrasonic standing waves – produced by four speakers that surround an open square area approximately 21-inches wide – to trap pieces of wood, metal, and water. These four phased arrays use standing waves to create an ultrasonic focal point in that space, generating a suspending force, thus trapping particles and objects in mid-air, while moved the objects can be accomplished by manipulating the waves. Click here to view the first image in today’s viral picture gallery. Continue reading for the five most popular viral videos today, including one showing how to make your very own aluminum foundry.