Learn about Dr Karl, the universe and everything, and discover how air-conditioning is sexist, how you can kill a spinning hard drive by shouting at it and how space junk is threatening our future capabilities for space travel. Could there be life on one of Saturn's moons? How much power could you collect from all the lightning on Earth? Why do books have that book-smell? Why is 10 per cent of the Earth's land area prone to sinkholes? Why are some people chronically late? What would happen if the Earth stopped spinning? Why do most people hardly remember anything from the first half-a-dozen years of their life? Why do some songs turn into 'earworms' and stick inside your brain? Why does your hotel-room access card get wiped so easily? And is your home wi-fi really spying on you?