Focus Article: Molecules that add up

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Abstract
As information technology encroaches more and more into our lives, attention is turning to how the revolution started by silicon logic gates can be carried forward. Smaller-scale information processors is one approach to which chemical solutions can be imagined. The first molecular logic gates were built in Belfast a few years back. These artificial systems use chemical inputs and light output, reversing the natural roles existing within the eye. They can now do simple addition.

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