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The world is 4.5 billion years old, but with the help of this video on earth history readers can imagine evolution as if it were a single day.

In the context of a 24 hour day, this video from WHO succinctly and simply outlines the chronological order of events that's resulted in human life and the world we know today.

The video is completely comprised of stop-motion filming techniques and uses puddy and photos to illustrate the different stages of evolution.

Beginning at 4am, simple single cell organisms form. That lasts all morning until 1pm when the first cells with internal organisms are formed. At 630pm the first multi-cellular life forms. By nearly 10pm plants begin to appear on earth. Humans don't come into the picture until the last few seconds of the day.