Concept Explaination:

In this story, endothermic and exothermic reactions are studied, as well as kinetically driven and thermodynamically driven reactions.

Endo and Exo Thermic each represent an endothermic and exothermic reaction, respectively. Both of them are trying to reach a new destination where they can build a new stable life. In Endo's case, he takes a path that results in instability for the product, where there isn't enough space for him to build a stable home. As for Exo, though he has to overcome the mountain peak-the activation energy-he ends up in a valley, where he ends up being at lower energy and more stable.

The path that Endo and Exo take also represent kinetic and thermodynamically driven reactions. Endo takes a path that does not require a great deal of energy to overcome, but is not as energetically stable at the end, and thus turns back. Since the path does not require very high relative activation energy, it's easily reversible.

In contrast, Exo takes a path that's thermodynamically favored-it requires more activation energy, but the result is much stable. Exo requires a lot of energy to climb up the peak to this mountain, and by the time he reaches the bottom, he has lost all of his energy and is in a stable environment.