Back in 2002, the Cobb County Board of Education (in Georgia) printed a sticker for schools to put on science books dealing with evolution. The sticker says:
This textbook contains material on evolution. Evolution is a theory, not a fact, regarding the origin of living things. This material should be approached with an open mind, studied carefully, and critically considered.
Colin Purrington, associate professor of evolutionary biology at Swarthmore College (in Pennsylvania) liked it so much that he created a whole page of disclaimer stickers, warning readers to approach subjects such as gravity, the earth being round and God "with an open mind".