Everything Under The Sun

In this week's show we answer three questions from Wren, Abi and Tomos. They would like to know why rainbows are so colourful, why some people talk in their sleep and why some people spit when they're talking? We discuss where the rainbow's colours come from and we talk about Iris, the goddess of the rainbow, and why the colours of our eyes are named after her. We discover the parts of a sleep cyc...

In this week's show we answer three questions from Bea, Finn and Tommi, with special help from James McLaine from London's Natural History Museum. They would like to know whether blue whales can talk to killer whales, why killer whales have white patches by their eyes and why hammerhead sharks have heads shaped like hammers? We find out the different ways whales and dolphins communicate underwater...

Children are full of curiosity and questions about the world. Each Friday, join Molly Oldfield, the very first question writer or QI elf on the BBC TV show QI and author of three books as she answers questions - often with the help of experts - sent into the show by children around the world. If you or a child you know has a question you would like answered, or just want to learn interesting facts...