Yoga Ball should totally be an Olympic sport. I'm totally going to try this at my next pilates class.
This video uses line drawings and simple diagrams to give you an idea of what it would be like to exist in some of the higher dimensions. As you might expect, it starts getting pretty trippy once it gets past the third one.
Tech Buzz Mixing Crayon Physics and Magic Pen, it's a Flash game that lets you build tiny animated machines. The object is simple: Create a contraption to move a ball or block across the screen. It's easy to test and change your contraptions, plus you can see what other players have done in the past to compare ideas.
Mixture of cornstarch and water defies gravity over vibrating subwoofer. Watch as the pool of opaque goo dances over the speaker. The mixture is known as a non-newtonian liquid. I won’t purport to know what that is, nor do I really care very much, but if you do you can check out the link. I’d venture to say it looks too awesome for words.