Heron of Alexandria created over a startling 80 inventions during his lifetime, and most of them relied on the properties of air and water.
Your head does a pretty great job of keeping your brain safe most of the time. Your skull can take a lot of jostling before your thinker suffers damage.
The Antikythera mechanism, one of the world's oldest known gadgets, has coughed up another secret. In addition to tracking time and upcoming Olympic games, the mechanism was also great at tracking the motion of the Sun across the sky.