Are the aztecs/myans correct of the end of the world: i think december 20 2012?

i watched a show on the history channel about the end of the world and it talked about the myans or aztecs(i dont remember which one) predicting the end of the world on december 20 2012. My dad told me it wasnt true. then it talked about a guy that did some graph of the chinese I-ching theory. my dad still said it isnt true either. Then there is a show on the history channel called The Unsiverse. and it talked about how there is a black hole in the middle of our universe. Again, my dad and some of my friends dont believe that. whats the truth?!??!? im frustrated on it. The myans/aztecs also said that there would be a black hole and they were true. A lot of what they predicted came true. And whats with the Crystal skulls that they made? i saw that on the travel channel. im confused. so please answer those few questions.