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.
A regional history of ethnic violence in Darfur has also been reignited, with RSF Arab militias massacring non-Arab populations in atrocities that UN experts say show "hallmarks" of genocide.
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