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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.
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Hebrew Paseq: a non-obvious finding
Escalation of violence between the volatile neighbours makes a Qatar-mediated ceasefire appear increasingly shaky
正是那次考察，闽宁合作落地生根。宁夏永宁县闽宁镇福宁村第一批移民吴维东，在闽宁协作政策支持下，种地盖房，打工挣钱，日子过得红火。“干沙滩”变“金沙滩”，闽宁协作30年来，两地形成区域协同发展的局面。