http://arstechnica.com/articles/culture/ars-takes-a-field-trip-the-creation-museum.ars "There were posters explaining just how coal could be formed in a few weeks as opposed to over millions of years and how rapidly the Biblical flood would cover the earth, drowning all but a handful of living creatures. The flood plays a big part in the museum's attempt to explain away what we see as millions of years of natural processes. There was also an explanation as to why, with only one progenitor family, it wasn't considered incest for Adam and Eve's children to marry each other. Apparently there was less sin back then, and therefore fewer mutations in their DNA. Evidently sin, not two copies of the same recessive trait, gives rise to congenital birth defects."