哈克特說，這種自願式調查容易受到「虛假受訪者」影響，使數據失真：「而且這不是隨機的。失真往往在年輕族群中最高。」
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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.
Восток Финляндии находится в экономическом шоке после закрытия границы с Россией. Как отмечает член финской партии «Альянс свободы» Армандо Мема в разговоре с РИА Новости, стране не поможет даже создание особой экономической зоны.
By the Renaissance, writers such as Shakespeare were talking of "star-crossed lovers", couples bound together by an overwhelming connection yet pulled apart by family, fortune or fate, as if the universe itself both wrote their love story and barred them from a happy ending.