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Lawrence Krauss is a theoretical physicist and cosmologist and is an advocate of scientific skepticism. Krauss "works to reduce the impact of superstition and religious dogma in popular culture". Like the others he believes that "religion" developed as superstition and fear of nature and evolved into belief in a supreme deity. The sum of his knowledge is that the universe came from nothing through the reasoning that the sum of positive energy and negative energy in the universe is zero (they cancel each other out) and hence it is possible for universes to come from "nothing."