Why world didn't end yesterday?

Nasa Explain 

Of course the world didn’t end yesterday. Those who thought it would didn’t understand what the ancient Mayan calendar was all about. Nasa scientists explain in this four-minute video. (Includes transcript)

This video was prepared by Nasa scientists to explain why we are still here on December 22, the day after some people believed the world was going to end. Now, that “doomsday” has passed and we are still here, it makes very good viewing.

You can see the text as you watch the video (click on the “cc” symbol if the text doesn’t appear) but to make it even easier for you I have included the whole transcript and have explained words that you might not know. Thus, this becomes a very good English lesson as well as a science lesson.