This fantastic plastic has molecules far longer than those of regular polyethylene, and these molecules are, in addition, packed tightly into a crystal structure rather than being scattered at random.

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In Brazil, however, a loose federal structure and a constitution packed with fine regulatory detail obstruct reforms.

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ADA2h has two helix-shaped structures called alpha helices that are packed against a flat, sheet-like structure.

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His conclusion is that the main difference is in the structure of the small columns of nerve cells that are packed together to form the cerebral cortex.

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The clock was packed away in 2008 ahead of a planned development of the city centre but the recession scuppered the plans leaving the structure homeless.

BBC: Newport mechanical clock gets new home in Llanwern