Conspiracy theories are pervasive and popular. A poll for the Scripps Howard media organisation in 2006 suggested 36% of Americans suspected government involvement or deliberate inaction in the 9/11 attacks, and belief in a Kennedy conspiracy ran at 40% in the same poll. A decade after Princess Diana’s death, one survey found a fifth of Britons believed she was murdered. And to millions across the world, 2009’s Apollo Moon landing 40th anniversary was a hollow sham because we have never been there.
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