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The tungsten lightbulb has served us well over the century or so since it was introduced, but its days are numbered now with the arrival of LED lighting, which consumes a tenth of the power of

Salty streaks have been discovered on Mars, which could be a sign that salt water seeps to the surface in the summers. Scientists have previously observed dark streaks (see image above) on the planet’s slopes which are thought to have resulted from seeps of water wetting surface dust. Evidence of salts left