The next time you walk down a sidewalk and come to a street crossing, you may notice some strange bumps and patterns in the concrete. I always thought these were for water drainage or extra traction. I was wrong! The real reason is much more complex and fascinating.
Is there anything worse than having a flimsy, lightweight keyboard sliding all over your desk while you type? Probably a lot of things, but not for Redditor ipee9932cd, who couldn’t find a keyboard case they liked so they went the extra obsessed mile to make their own using rock-solid concrete.
Turns out, dropping a giant concrete block onto a car ends exactly like how you would imagine it would: the car gets completely obliterated and smashed to smithereens. Crash Zone pulled off this incredibly silly stunt and filmed it in slow motion so you can see the damage in lovely, exacting detail. The concrete block basically pierces through the metal frame and sends shattered glass flying everywhere.
The most popular artificial material on Earth isn’t steel, plastic, or aluminum — it’s concrete. Thousands of years ago, we used it to build civilizations, but then our knowledge of how to make it was lost. Here’s how we discovered concrete, forgot it, and then finally cracked the mystery of what makes it so strong.