... Fortunately, the responsibility for providing evidence is on the part of the person making the claim, not the critic. It is not the responsibility of UFO skeptics to prove that a UFO has never existed, nor is it the responsibility of paranormal-health-claims skeptics to prove that crystals or colored lights never healed anyone. The skeptic's role is to point out claims that are not adequately supported by acceptable evidcence and to provide plausible alternative explanations that are more in keeping with the accepted body of scientific evidence. ... - Thomas L. Creed, The Skeptical Inquirer, Vol. XII No. 2, pg. 215