The Slinky? A Rubik's Cube? Newton's Cradle? None of those office time-waster stalwarts can even begin to compare with the brilliance that is this ultrasonic levitation machine that can actually defy gravity and make tiny objects float at your desk. We're not talking a flying hoverboard here, but you'll finally have a great use for all those crumbs left over from lunch.
The transducer used to generate the sound waves needed to lift even tiny foam balls is apparently louder than a jet engine, but because it runs at such an incredibly high frequency, it's well beyond the range of human hearing. In other words, you're not going to go deaf while playing with it.
Richard Haberkern wants to put one of his compact ultrasonic levitators on the desk of every slacker in the country, so he's started a Kickstarter campaign to raise a modest $10,000 (around $6000) to mass produce these kits. You can pre-order one of your own with a donation of just $120 (£72). [Kickstarter - Ultrasonic Levitation Machine via Technabob]