A word written in the book numbers might have had a different meaning from the same word in revelations as there is 1000 years of language evolution between the two writings. (religion.blogs.cnn.com)
Currently there is a debate as to what role sign language has played in language evolution, and whether the structure of sign language share similarities with spoken language. (sciencedaily.com)
The findings also show that social interaction is essential for language evolution. (sciencemag.org)