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In his State of the Union address this week, Trump alleged that Iran posed a direct threat to the US and that the country was “working to build missiles that will soon reach the United States of America”. But that claim has not been backed up with evidence by the White House or the Pentagon, and US intelligence reports from just last year say that it would take Iran 10 years to develop an intercontinental ballistic missile that could reach the US.
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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.
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