NeverWet is a water-repellent spray that can basically keep anything dry. It's cool, if not the most practical thing in the world. But apply it to a sidewalk, let it rain, and magical things start to happen.
A real life Eyedropper tool! This is awesome. A pen with a little censor that scans the color of the object you point it at, then you can write in ink that exact color, it's like the eyedropper tool in photoshop outside of the computer.