A few days ago I was merrily browsing the internet when I saw this intriguing post from Discovery: http://news.discovery.com/tech/gear-and-gadgets/worlds-first-hoverboard-for-realsies-141021.htm
If there is one invention that everybody has wanted since 1989, it's that hoverboard Marty McFly rode in Back to the Future II.
These real life hoverboards are being made with the brand Hendo Hover and are really cool. They let the rider glide around 1 inch above the ground and seem to have some sort of stabilizing system so they go where you want them to. Unfortunately, the board has to be used on a metal surface to create the electromagnetic repulsion and the battery only lasts 7 minutes at the moment (Hendo hopes to create fancy metal "hover parks" where the boards could be used, so that eliminates some of the problem of a metal surface).
So, how do they work? Well, to be honest, they are pretty complicated. I do know that it has to be something with changing the magnetic field in 2 coils of wire by varying the current applied to one of the coils. This draws a lot of electrical current, which is another obstacle to be overcome.
They had a Kickstarter page, I think it is still there (I can't look since the school blocks the website...) and if you donate enough money you can get a cool little hover block to mess around with and take apart, since Hendo wants people to begin innovating with their technology and see what can be created.
I can't wait to see what this stuff will do in a few years!