What's the fastest accelerator in the world? A space shuttle? A bullet fired from a gun? No. It's the spores found in animal dung in any field in the UK. These spores, that travel at an astonishing two millionth of a second, are captured for the first time with ultra high-speed cameras.
Other amazing footage shows the composition of a rain drop, while Richard Hammond explains how water is 800 times thicker than air and is perfect for dolphins to swim in, but not so much for humans.
We also take a closer look at the common garden Water Strider, which can skate across water at two metres per second.