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Bacterial world

Duration: 01:09

If a visitor from another planet were to analyse our bodies, they'd conclude that we were only 10% human. That's because around 90% of the living cells in a human body are made up of bacteria, some of the smallest and most numerous living organisms on Earth. Yet, in spite of their abundance, we find it difficult to see any of them without the aid of a powerful electron microscope. On the head of an apparently perfectly clean pin, it is only when we magnify 10,000 times that the size of the bacteria becomes clear and we can finally see the colonies.

Available since: Wed 23 Sep 2009

Credits

Presenter
David ATTENBOROUGH
Producer
Rupert BARRINGTON
Camera Operator
Rod CLARKE
Camera Operator
Mike FOX
Camera Operator
Richard KIRBY

This clip is from

State of the Planet IS THERE A CRISIS?

3 part series in which David Attenborough (DA) investigates the future of life on earth. 1. The variety of life is threatened by human activities.

First broadcast: 15 Nov 2000

Image for IS THERE A CRISIS? Not currently available on BBC iPlayer

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