This July 7, 2011, photo shows plans for a proposed religious theme park called Ark Encounter, at the Ark Encounter headquarters in Hebron, Ky. Kentucky says that the project is ineligible for tax incentives Dylan Lovan/AP hide caption

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Bill Nye (left) and Ken Ham debated whether creation is a viable model of origins in the modern scientific era during a lengthy debate Tuesday. The points they raised have fueled an online conversation that continues. YouTube hide caption

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Bill Nye, left, and Ken Ham take the stage to debate evolution and creationism Tuesday in Kentucky. YouTube hide caption

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Bill Nye, left, and Ken Ham will debate the issue Tuesday at 7 p.m. ET. AnsweringGenesis.org hide caption

itoggle caption AnsweringGenesis.org

Kansas Board of Education members look over language for a science textbook in 2007. The fight over the teaching of evolution has been particularly fierce in Texas, which because of its size influences many textbook publishers. Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP

Fire breathing only makes it harder to talk: An activist with the Science and Rationalists' Association of India demonstrates against the claim that Mother Teresa performed a miracle in Calcutta. Deshakalyan Chowdhury/AFP/Getty Images hide caption

itoggle caption Deshakalyan Chowdhury/AFP/Getty Images