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.
The BBC has apologised and called what happened "a serious mistake", saying Davie has instructed the Executive Complaints Unit (ECU) to "complete a fast-tracked investigation and provide a full response to complainants".
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is debatable, although historical accounts generally do. They are certainly of a
The Halley VI Research Station looks like something from a science fiction movie
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