Why do Guinness bubbles go downwards?

How the processing power of a brain compares with a computer and why the bubbles in Guinness go downwards...
14 March 2014
Presented by Chris Smith

Guinness.jpg

A pint of Guinness

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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?

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