Mix two parts cornstarch and one part water. Swirl your fingers in it slowly and the mixture is a smoothly flowing liquid. Punch it quickly with your fist and you meet a rubbery solid -- so solid you ...

"Mad" scientist? Let's get real. Real-life scientists are pretty much like the rest of us. But they do have a lot of experiments to show you, some of which can make great special effects. For secret ...

These Aha! resources are also available in Spanish! A funny thing happens when you add cornstarch to a liquid and heat up the mixture: It gets really, really thick, or viscous. That thickening process ...