Why do Guinness bubbles go downwards?

Ask the Naked Scientists

English - March 14, 2014 21:09 - 21 minutes - 19.6 MB - ★★★★★ - 60 ratings
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How do the processing power of a brain compare with a computer? How can we shield astronauts en-route to Mars? Do ants prefer protein? What causes left handedness? Why do bubbles go downwards in a glass of Guinness? And do older makes of television emit X-rays? Like this podcast? Please help us by supporting the Naked Scientists