When we want something, we do what it takes to get it. We make the time, muster the energy, and develop the necessary skills. It turns out that the engine of change is desire. The way our desires evolve both defines and designs the entire history of humanity. As humankind’s desires developed, they urged people to study their environment so they could fulfill their wishes. Unlike minerals, plants, and animals, people constantly evolve. For every generation, and for each person, desires grow stronger and stronger.