Miller argues that the position of most anti-evolutionists is really scientific illiteracy. Everything in science—from gravity to relativity—is “just a theory,” he points out. If an explanation comes along that more successfully accounts for the observations and evidence, science adopts it, replacing the earlier “truth” with the newer, more complete one. If someone, for example, can come up with a better explanation than gravity for why your spilled coffee falls on the floor instead of the ceiling, science will happily give up the “theory” of gravity. Science is always provisional, Miller explains, but that does not mean that it is controversial, or a matter of opinion, faith, or personal preference. Similarly, evolution via natural selection is a “theory” only in this provisional, scientific sense.