TV's "Science Guy" Bill Nye speaks during a debate on evolution with Creation Museum head Ken Ham on Feb. 4 at the Petersburg, Ky, museum. Dylan Lovan/AP hide caption

How do you explain the dinosaur fossil record if the world is only 6,000 years old? Bas Czerwinski/AFP/Getty Images hide caption

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

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

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

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

Mike Zovath, co-founder of Answers in Genesis ministries, poses for photos at the Ark Encounter headquarters in Hebron, Ky., in July 2011. Dylan Lovan/AP hide caption

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