There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
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For almost a century, until the 1960s, soda bottles in the US were generally meant to be returned.
Flash can be overpowering
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Despite her increasingly public profile, fans were surprised to see the singer pop up on BBC quiz show The Weakest Link earlier this month.