We're not building tools anymore. We're witnessing the emergence of something between software and life. Between servant and peer. The agents calling… - Peter Diamandis

During the early sixteen hundreds in England, two-thirds of all children died before the age of four, and the resulting life expectancy was only thirty-five years. It was the industrial revolution that started us on our trend toward longevity. A more robust food supply coupled with simple public health measures such as building sewers, collecting garbage, providing clean water, and draining mosquito-infested swamps made a huge difference.

Deception. What follows digitalization is deception, a period during which exponential growth goes mostly unnoticed. This happens because the doubling of small numbers often produces results so minuscule they are often mistaken for the plodder's progress of linear growth. Imagine Kodak's first digital camera with 0.01 megapixels doubling to 0.02, 0.02 to 0.04, 0.04 to 0.08. To the casual observer, these numbers all look like zero. Yet big change is on the horizon. Once these doublings break the whole-number barrier (become 1, 2, 4, 8, etc.), they are only twenty doublings away from a millionfold improvement, and only thirty doublings away from a billionfold improvement. It is at this stage that exponential growth, initially deceptive, starts becoming visibly disruptive.

How Musk chooses which streams to explore depends on the relationship between those probabilities and the importance of his objective. “Even if the probability for success is fairly low, if the objective is really important, it’s still worth doing. Conversely, if the objective is less important, then the probability needs to be much greater. How I decide which projects to take on depends on probability multiplied by the importance of the objective.