Page last updated at 09:55 GMT, Tuesday, 27 April 2010 10:55 UK

How Gallileo made his telescope lens

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Four centuries ago, the Italian mathematician and astronomer, Galileo, manufactured a telescope - a feat which helped change the history of science and open our eyes to new wonders in the heavens.

Michael Mosley meets lens maker Romano Zen who demonstrates how Galileo would have fashioned lenses using a cannonball and a turning wheel.

Michael Mosley presents The Story of Science on BBC Two on Tuesdays at 2100BST from 27 April.

Watch more clips from the series.

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