Human Body

The average primary school student can move about two and a half litres of air in a single maximum breath. But vital capacity varies enormously — and the factors that predict who has the most are not what most people expect.

Your bones are not made of one thing — they are made of two. Vinegar can remove one of them completely, leaving the other behind.

Your eardrum has been vibrating every single time you have heard a sound — for your entire life. But you have never seen it. What if you could build one and watch it work?