Have you ever wondered? Irradiating food makes it last longer, so why won’t the supermarkets sell it? Radioactivity destroys cancers, but does it leave a patient radioactive afterwards? How do we know things like ‘Woolly mammoths died out 10,000 years ago’, which is before humans learned to write? Why do some people wear radioactive watches that shine in the dark? What makes the ‘Northern Lights’ the most colourful sight on Earth? Could a low dose of radiation actually be good for you? Do you get a dangerous dose of cosmic rays if you fly often?
