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Grenfell Tower, a residential block in London, made headlines around the world. At least 79 people have been confirmed dead and many are still missing. But how unusual is this? More or Less speaks to Robert Solomon, a fire protection engineer, who explains the recent history of fires in high-rise buildings around the world. Are tower blocks really dangerous? Or are they safer than houses? Presenter: Tim Harford Producer: Richard Vadon (image:Smoke rises from the 24 story Grenfell Tower in West London. Photo: Leon Neal/Getty images)