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For example, the number line is infinite, regardless of whether you start it at –∞, 0 or 1.

Even such bonkers-looking numbers, however, together with all the rational numbers, make up only a tiny fraction of the real numbers, or numbers that can appear along a number line.

But it turns out that if you happened to pick out a number at random on a number line, you would almost certainly draw a “noncomputable” number.

The rest of the numbers on the number line are irrational numbers.

Born in 1596 in the middle of France, Descartes would bring zero to the center of the number line, and he would seek a proof of God in the void and the infinite.