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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US says it supports Pakistan's 'right to defend itself' against Afghan Taliban
history of computers. We are, right now, in the 1960s. The credit card is in its