The Creation Research Society (CRS) is a Christian fundamentalist research group that requires of its members belief that the Bible is historically and scientifically true in the original autographs, belief that "original created kinds" of all living things were created during the Creation week described in Genesis, and belief in flood geology. The organization has produced various publications describing what it calls creation science, including a journal and a creation-based biology textbook; use of the textbook in public schools was ruled unconstitutional in Hendren v. Campbell.