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Atheists are often skeptical. About everything. And from time to time, atheist forums and Facebook pages will encounter claims that stand against the tide of accepted opinion.

They assert that 9/11 was an inside job. They insist that the moon landing was faked. They posit elaborate theories on everything from the JFK assassination, to the Roswell flying saucer to the death of Princess Diana.

What are some of the conspiracy theories you've encountered in your own circle? Do they have merit and warrant further time and attention? Or are they merely products of overactive imaginations?

Dr. Michael Shermer of Skeptic Magazine joins us. Plus, your calls and emails.