Our universe can be specified by a few numbers, including the strengths of the forces of nature (gravity, electromagnetism, and the nuclear forces), the number of macroscopic dimensions of space-time (four), and the density of dark energy (the source of the acceleration of the expansion of the universe).

Steven Pinker, Enlightenment now: the case for reason, science, humanism, and progress, New York, 2018, p. 423