The rate of technological and cultural innovation increases exponentially for humans. At some point, the pace of change approaches infinity; from moment to moment, magical new technologies appear, radically transforming humanity's relationship to the world. This is the singularity.
Since they took control of fire Humans have been gradually integrating their tools into themselves. They have modified their environment extensively, and have integrated human capabilities into their tools. The pace of these changes has been gradually accelerating, in the same way that compound interest effects your investments. For most of human history the rate of change was slow. Many generations might live essentially the same lives as their parents and grandparents. [MORE TO COME]