According to people from every possible generation dating back to many years ago the world could possibly end in the year 2012. There are many reasons to support this belief, but let's look back to the earliest ages.
According to the extremely accurate and detailed calendar of the early Maya civilization, scientists believe that the world is scheduled to end on December 23, 2012. This is the exact day that the calendar ends. What makes this so believable? The Maya used an extremely accurate form of time keeping. They measured time even more accurate than we do today. They split up there years into many different cycles of time which kept repeating. But in 2012 the calendar ended with no apparent reason. Why would a civilization from thousands of years ago choose this exact date for the end of time? No one knows the answer to this but it sure is scary to me.
Now back to the building of the pyramids. The pyramids, as you know have been searched and excavated to an extraordinary amount. But not long ago, scientist began to see an incredible pattern in the great pyramid. They figured that if they start at the bottom of the pyramid and count every inch of stone as 10 years or so they might find a pattern. And they did. They found that at the bottom of the first hallway was the year 0 which was the birth of Christ. Then they kept measuring up to find that every top and bottom of a room or hallway was a very famous event in the history of the world. Then when they arrived at the top hallway, the bottom was the first year of World War 2. It might have seemed to be coincidence, but at the top of the highest hallway, the very last year was indeed 2012. This must be the most extraordinary coincidence in the history of the world. Or could it be real? Could the ancient Egyptians have known? Another scary thing to think about.
Now to the modern times where science is king. Scientists see no reason that the world couldn't end in 2012 according to the primitive theories. They actually believe that a polar shift could occur. A polar shift is when the magnetic fields reverse and north becomes south and vice versa. This could somehow cause a major disaster that could potentially destroy the world. I don't understand how it works either, but the scientists do and I'm going to take their word for it.
As you can see, I do not exactly believe these theories, but they are always fun to think about if the world is really going to end so soon. It might even make you think about which day is going to be your last. Hahaha.