Why can I hold off a bathroom stop when I'm driving? How does my brain store information? Why don't birds sitting on power lines get electrocuted? Why do bubbles in a bath disappear when the water gets cold? Why are rainbows such perfect arches? What causes an itchy backside in the middle of the night? Why have spiders never evolved wings? How do our bodies maintain a constant temperature? Plus, what exactly is going on with the volcano in Guatemala... Like this podcast? Please help us by supporting the Naked Scientists