The 10 Most Popular Conspiracy Theories

Agatha Christie once famously said, "The simplest explanation is always the most likely." However, when something shocking or catastrophic happens in our lives, simple explanations just aren't satisfying. We crave deeper reason and meaning and when that isn't given to us, sometimes we create our own. This is how conspiracy theories are often born -- someone doesn't like the official account of a major event and challenges it with a different version. Conspiracy theories can attract a wide array of people, from vehement supporters to those who just like a good story. Whether they're somewhat believable or completely ridiculous, the most popular conspiracy theories got that way for a reason -- they're just plain fascinating.

1. Lee Harvey Oswald didn't act alone (or possibly at all)....