With six children between them, Johansson and Liikamaa are also able to take time with family while the other one holds the fort.
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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Trump reduced tariffs on Vietnam and removed that country from the United States’s export controls list after the Hanoi government approved his family business’s $1.5bn golf course and real estate project.
The 24-year-old, whose hits include Illegal, Stateside and Boy's A Liar, is the first woman to be given the prize since its inception in 1977.
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