History aims to alter our understanding of the universe with Big History, i.e., the look at our world spun into a web that has been stretched for over 13.7 billion years of history. Therefore, Big History discards the traditional timeline that has been stretched for a few thousands of years into the past. To alter the understanding of viewers, History uses what they call eight thresholds, moments that have irreversibly changed our world.
These thresholds, which are clearly articulated in Disc 3, are:
1. The Big Bang;
2. The birth of the stars;
3. The creation of the complex elements;
4. The formation of the earth;
5. The beginning of life;
6. The rise of collective learning among humans;
7. The farming revolution;
8. The modern revolution.
The hidden link among these eight thresholds is the spread of power and information over space and time.
Big History ends Disc 3 by speculating over the rise and nature of the next big threshold:
1. Will human beings be able to successfully colonize other planets?
2. Can technology overtake humans?
3. Will human beings discover intelligent life elsewhere?
4. Will intelligent life discover the existence of humans on earth and / or elsewhere?
5. Will a catastrophic event coming from outside the planet earth dramatically change its course?
6. Will a new worldwide disaster on earth take central stage?
7. Will human beings cause a catastrophic event on earth?
These possible thresholds are not mutually exclusive.
Discs 1 and 2 complement the understanding of Disc 3 by looking at specific connections crisscrossing through time and space. Examples are the role of the domesticated horse in the spread of some languages or the role of salt in the rise of civilizations.
In summary, Big History encourages viewers to rethink anew what they have been taught and / or have discovered on their own.