These cuts to physics research will be a disaster for UK scientists – and for our standing in the world | Jon Butterworth

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The Emacs Shell has a few other advantages:

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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.