Gallium nitride is a new semiconductor that promises to outshine silicon, eclipse gallium arsenide and revolutionise our lives by reducing demand for electricity. John Emsley repor...
Scientists are taking a leaf out of Nature's book by attempting to harness enough energy from sunlight to carry out useful photochemical reactions. Philip Ball and David Andrews ta...
The three-way catalytic converter is a wonderful example of what technology can achieve in the face of new legislation, says Rosslyn Nicholson. But there's no room for complacency....