If you made plans on how to spend the last remainings days of Earth's existence, forget about them. Humankind is safe. At least, according to US space agency NASA. The organisation is confident that the much-hyped apocalypse will not happen on December 21 as - so say some people - is predicted by the Mayan calendar. That is why the space agency has released a video ten days ahead of schedule entitled "Why the World Didn't End Yesterday".If you made plans on how to spend the last remainings days of Earth's existence, forget about them. Humankind is safe. At least, according to US space agency NASA. The organisation is confident that the much-hyped apocalypse will not happen on December 21 as - so say some people - is predicted by the Mayan calendar. That is why the space agency has released a video ten days ahead of schedule entitled "Why the World Didn't End Yesterday".