While that title might sound like hyperbole, it is the truth. If concrete truly did dry out, it could be reconstituted with water like dry pasta, and couldn’t be used to build things. MinutePhysics explains the not so subtle differences between something being “dry” and “set.”
Grand Illusions shows off a physics plaything that demonstrates the differences between the shock absorbency of different metals, with one side coated with a special amorphous metal which allows a bearing to bounce like mad off its surface. More here. (Thanks Paul!)
If you’ve ever been clocked on the head by a golf ball, you’d be certain they’re hard as a rock. But they’re actually quite pliable. Here’s slow-mo footage of a golf ball as it hits a steel wall at 150mph. While it’s likely it was a practice ball, a regular ball still flexes quite a bit.
Beyond Slow Motion picked up a stack of colorful Magination magnets, then captured how dropping a single one into the mix causes them all to pull together toward each other. By adding some water and colored powder to the mix, the effect is even more impressive.
The Earth is constantly spinning to the East at about 1,000 mph, so you’d think that it would take basically no time to fly from East to West. Minute Physics explains why this isn’t the case, which is basically the same reason we’re not all constantly in motion.
Gav and Dan of The Slow-Mo Guys take something as simple as a foam ball soaked in water and turn it into a yet another fascinating subject in front of their 1600 fps camera lens. The spiraling water flying off the ball it look like a spinning planet with orbiting rings.