A tourist was visiting New Mexico and was amazed at the dinosaur bones lying about. The tourist ask an elderly Native American, who served as a guide.
Tourist : “How old are these bones?”
Guide : “Exactly 100 millions and three years old”
The tourist seems inquired then asks again…
Tourist : “How you can be so sure?”
Guide : “Well…. A geologies came by here and told me these bones were one hundred millions years ago, and that was exactly three years ago”