The researchers have designed a bulb that is three times more energy efficient than today's best offer and can cut lighting bills by 75 per cent.The bulbs are made using Gallium Nitride (GaN), a man-made substance used in LEDs (light emitting diodes). It is routinely used in bike lights, mobile phones and camera flashes.
Scientists say they have discovered a way to stop cancer spreading to other parts of the body.Cancer metastasis, where the cancer spreads from its original location, is known to be responsible for 90% of cancer-related deaths.