Actually, it's more accurate to say that science evolves as new information and new tools for obtaining information come along. Most of the time old explanations are refined and sharpened by new discoveries; though it's not unheard of, it's actually quite rare for old explanations to be discarded and replaced wholesale. Even then, it might be the case that the old explanations are still relevant. For instance, Newton's laws are still useful and indeed far simpler in many practical contexts, even though Einstein's relatiivity theories are many magnitudes more accurate and yiled truer results.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
