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Tim Harford looks at the different claims made about how many people have been killed in the apparent chemical attack in Syria. The cost of care has forced a million families to sell their homes in the past five years, it’s been reported – but is it true? What can statistics tell us about the safety of Super Puma helicopters? Tim finds out whether left-handers really die nine years earlier than right-handers. And, he assesses the facts behind the claim that 300,000 attempts have been made to access pornographic websites at Parliament in a year.