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.
Here’s our recap of everything Apple announced this week:
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В США отказались от ответственности за ситуацию на Ближнем Востоке08:28
Linzi Stone, 47, from Plymouth, was meant to start chemotherapy on Friday but has no idea if she will make it back in time because flights across the Gulf have been cancelled for days amid the US-Israeli war with Iran.