The 9/11 conspiracy theorist David Icke (left) with psychologist Professor Chris French.
It's the work of alien lizards, men in black, the government or even the Queen... Whenever a major news story breaks, conspiracy theories spring up overnight with a subversive slant on the official facts. Who's behind these theories, and why are some of us so ready to believe in them?
Watch Channel 4 Education programmes for free on your PC with Channel 4's on demand service 4oD.
Channel 4's Citizenship and PSHE website.
Index of Notes to support Channel 4 Learning programmes.
Full listings of Channel 4 Learning programmes for the week ahead.