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Part 1: The Building Blocks of Life

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Duration: 0:05:29 | Added: 28 Oct 2014
Our bodies are made up of trillions of cells but it doesn’t matter how closely you look, you still won’t see them.

In fact, most of our cells are smaller than the width of a hair. To make sure that our bodies work correctly, our cells have to talk to each other – a pretty daunting task. So how do our cells communicate?

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