* Astronomy

New development could lead to more effective lightbulbs

US researchers say they have developed a technique that can significantly improve the efficiency of the traditional incandescent lightbulb.
These older bulbs have been phased out in many countries because they waste huge amounts of energy as heat.
But scientists at MIT have found a way of recycling the waste energy and focussing it back on the filament where it is re-emitted as visible light.
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