December 4, 2012 1 Comment
Alright, I lied, this post isn’t strictly speaking about walking on water. It’s about walking on water and cornstarch–a combination you’re probably familiar with if you’ve ever been a kid or raised a kid. When I was in elementary school we called it “Oobleck,” a reference to this book. I’m sure it goes by a lot of different names, but that’s the one I’ll use here.
Oobleck, famously, flows like a liquid unless it is exposed to sudden force, at which point it “seizes up” and acts much more like a solid. As a result, you can walk on it, if you do it quickly enough, because the sudden forces of your footfalls make it go momentarily stiff. But you can’t stand on it, because while you’re still exerting a force on the Oobleck with your weight, that force is no longer sudden.
It’s all summarized nicely by the antics of these nice gentlemen on some sort of Barcelona-Based, Bill-Nye style science show. You don’t have to speak Spanish to appreciate it, but if you do, please tell me, is Google correctly translating the name of the show (“Hormiguero Cientifico”) as “Scientific Ant Hill”?
This is in fact a rather “old” clip by internet standards. What caught my attention this week is this newer video showing the same trick, but in super slow motion: