Ok, besides all the religious views and Mayan calendar skepticism, there are some scientific probabilities that could occur on Dec. 21, 2012. In the first time since 2001, on Dec 21, the sun's magnetic poles will switch. This also happens to be when Jupiter and Saturn are lined up closest to the sun. When the two largest planets of our solar system are lined up with the sun, it creates magnificant disturbance in the sun's magnetic concentricity field. These two events can cause solar flares. They have a good possibility of being very large. Even a small one's radiation that comes in contact with Earth can cause a whole continent to go without electrical power. At the same time, our solar system will be crossing over the Milky Way's Galactic Equator. The imaginary line is still a theory, but since there is a massive black hole in the middle of the Milky Way, crossing this equator could switch magnetic fields. Therefore, Earth's magnetic poles could move substantially. This equator also is the point in our galaxy where mass is maximized. More mass is more gravity equals the potential for greater solar flares. So all of this could lead to earthquakes, volcanoes, very high tides, increase melting of polar icecaps, and solar flares that could affect Earth. Something will happen, it could be a massive change, or a very little one. We still do not know what will happen when our solar system goes through this date. We have never seen this many possibilities all in the same short time period. Hell, science just discovered many of these possibilities and theories within the past decades. I'm pumped and can not wait to find out what will happen.