1.   But the researchers say they found a way to construct the circuits using a chemical process, making the switches as small as a molecule.

2.   That is even how electronic circuits are constructed, with signals and passages proceeding according to sequences and choices.

3.   The thin coating is used to construct electronic circuits, and is now being adapted to many uses as diverse as fuel cells and solar instruments.

4.   But the researchers said they found a way to construct the circuits using a chemical process, making the switches as small as a molecule.