Invisible Rube Goldberg Machine
At first glance, the Rube Goldberg Machine you’re about to see appears to be just some clever video editing, but it’s actually just a real optical illusion. Put simply, a thick piece of glass sits next to a mixture of two clear, colorless oils, which is adjusted to match the glass’ refractive index. When this glass is submerged in the oil, it seemingly disappears. Read more for the video and additional information.

For those who don’t know, a Rube Goldberg machine, named after American cartoonist Rube Goldberg, is essentially a machine intentionally designed to perform a simple task in an overly complicated way. They normally consist of a series of simple unrelated devices; the action of each triggers the initiation of the next, eventually resulting in achieving a stated goal.

Ravensburger Gravitrax Starter Set Marble Run & STEM Toy For Kids Age 8 & Up - Endless Indoor Activity for Families
  • What you get - GraviTrax is an innovative marble run and STEM toy for boys and girls ages 8 and up. It comes with 122 pieces and is an ideal holiday or birthday gift for smart, curious kids.
  • Innovative - The GraviTrax interactive track system allows you to design and build your own race tracks and experiment with engineering, gravity, magnetism, and kinetics to propel your ball to the finish.
  • Clear instructions – Comes with clear instructions so that you can start construction, and start playing, with this fun brain game within minutes.
  • Develops critical skills – Playing and building with GraviTrax builds spatial reasoning and planning skills, and provides a great stealth learning experience.
  • As Seen on TV – GraviTrax was featured on 'Live With Kelly and Ryan' As one of the best products shown at the 2018 New York Toy Fair.