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In Iraq, estimates of the death count since the war started 2003 range from 100,000 to about one million. Tim Harford explores why such a range exists and what methods are used to count those killed during war. Meanwhile he discovers that Iraq's population has been growing strongly over the same period. Plus, mathematician and comedian Matt Parker presents his guide to the imperial measurement system. This programme was first broadcast on the 麻豆官网首页入口 World Service.