It is common knowledge that man's ability to communicate sets him apart from other creatures. Only recently, however, has it been discovered that man has been using palindromes throughout the aeons. A paleontologist has interpreted one of the oldest cave murals ever found to be saying OG, GO.
"Palindromic History of Civilization,"
Word Ways: Vol. 23
, Article 7.
Available at: http://digitalcommons.butler.edu/wordways/vol23/iss4/7