Rapper B.o.B was on a roll earlier this week. Not because he had a new song to promote, but because he sent out a series of tweets about how the Earth is flat. Yep, that's right. B.o.B is a "Flat Earth" truther.

It all started with this:

Then there was this:

It's a shame B.o.B dropped out of school after 9th grade, because he probably would've learned that we figured out this whole "spherical Earth" thing about 2000 years ago. Here are some other popular conspiracy theories:

1.) The moon landing was faked by NASA.

NASA/Getty Images
NASA/Getty Images
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Many of the same folks who believe the Earth is flat are also convinced that the 1969 moon landing was a hoax. Skeptics cite altered photos, strange shadows and the U.S. wanting to win the "space race" with Russia as evidence that "one giant leap for mankind" NEVER happened.

2.) President John F. Kennedy was not assassinated by only one person.

Getty Images
Getty Images
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JFK was assassinated November 22, 1963. There are so many theories as to who actually fired the fatal shots. Lee Harvey Oswald is credited with the shooting, but he was shot and killed just two days later, making many uncertain if he truly acted alone--or acted at all.

Get more crazy conspiracy theories HERE.

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