There is a maxim about the universe which I always tell my students: That which is not explicitly forbidden is guaranteed to occur.
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About Lawrence M. Krauss
Lawrence M. Krauss was a contemporary American particle physicist and cosmologist. Lawrence Maxwell Krauss is a Canadian-American theoretical physicist and cosmologist who taught at Arizona State University (ASU), Yale University, and Case Western Reserve University. He founded ASU's Origins Project in 2008 to investigate fundamental questions about the universe and served as the project's director. Read more on Wikipedia →