Nibiru and 2012 whats your take?

Ok here's a little of what i've researched, There are over 7 ancient civilizations that knew of the coming events, The lost book of Nostradamus indicates the same time as one of significance, there have been mayan calender crop circles indicating the date Dec 21 2012. In Sumerian text it is written that Nibiru collided with our planet which created the asteroid belt and earth as we know it today and that we were genetically designed by beings called annunaki from a planet orbiting Nibiru to mine gold to repair their space craft. It has been discovered that in humans two chromosomes fused to produce a total of 46, because most other primates also have 48 which is not a natural occurrence otherwise other primates would have evolved the same way we have. That's just a little there's loads of stuff, What do you think of our origins and the events to come in 2012, load of bull or is scientific evidence mounting to an undoubtedly real outcome? Big question I know just put whatever you feel in relation to what I've said I'm very interested in others opinions and would appreciate it greatly.