The "fine-tuning" of our universe is explained by the Weak Anthropic Principle.

goes halfway toward an answer by applying a probabilistic selection function: “the relationship
 * The Weak Anthropic Principle

has been logically selected by the fact that only certain kinds of universe can accommodate acts

of observation and an observer like the questioner.” This is right as far as it goes, but omits the

generative, pre-selective phase of the explanation … the part that accounts for the selection

function and the domain to which it is applied. In this respect, the WAP is a bit like natural

selection; it weeds the garden well enough, but is helpless to grow a single flower.