Why do we teach kids nursery rhymes? How do we know how anatomically modern humans populated the world? What is cataract surgery, how is cataract surgery performed, and is there an upper age limit? Is most human behaviour innate, or learned? Why does water boiled in a microwave sometimes explode when you add sugar or coffee? Join Dr Chris and TalkRadio 702's Relebogile Mabotja to find out... Like this podcast? Please help us by supporting the Naked Scientists