Essential topics covered in 100 Facts Science: Experiments, vital discoveries and inventions Scientists at work in the laboratory Computer science phenomena and what the future holds Examples of 'I don't believe it' fascinating facts: Light is the fastest thing in the Universe, travelling at 300,000 kilometers per second. That's seven times around the world in less than one second! Science explains how animals such as birds or whales find their way across the world. Some detect Earth's magnetism, and which way is north or south / others follow changes in gravity.