 Our best current theories of fundamental physics are the Standard Model of elementary particle physics and the theory of general relativity. The Standard Model accounts for three of the known four fundamental forces of nature—the strong, the weak, and the electromagnetic force—while general relativity accounts for the fourth—gravity. Arguments according to which our universe is fine-tuned for life are aimed at showing that life could not have existed for the vast majority of other forms of the laws of nature, other values of the constants of nature, and other conditions in the very early universe.