The Illuminati still rule the world, the Moon landings were fake, and Elvis is alive and working as a preacher. When it comes to conspiracy theories, there is no shortage of weird and wacky “alternative truths” out there. But although it is easy to dismiss conspiracy theories as “unhinged beliefs held by a small number of paranoid idiots”, said New Scientist , they are in fact the product of normal human psychology.

“Once someone has fallen down the rabbit hole”, said The Observer , “everything becomes evidence confirming that belief system”. In the 21st century, this inclination is exacerbated by social media algorithms that create echo chambers, reinforcing existing beliefs by pushing similar messaging.

Here are some of the most intriguing and bizarre conspiracy theories.

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