Израиль нанес удар по Ирану09:28
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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.
Away from the crowds, work is underway to install a red carpet walkway to the venue for the Brit Awards next weekend, the first time the prestigious UK awards ceremony will be held outside of London.