Chelyabinsk meteor trace Alex Alishevskikh, via Wikimedia CommonsLast week's meteorite impact: cosmic coincidence, or a sign of the Mayan apocalypse? Brush up on the nuttiest theories floating around the Web. When something as mundane as a birth certificate is major conspiracy-theory fodder, it should be no surprise that the folks in tin foil hats have already concocted some not-so-obvious explanations for last week's meteorite crash in Russia. Read on for our four favorite space-rock conspiracy theories, in order from least likely to most likely. 1. The Mayan apocalypse conspiracy theory. ... Read More