Take a moment to ponder the thought of walking 85,000 miles.
That's like hiking from New York City to Los Angeles 35 times. The distance is more than twice the circumference of the planet Earth.
It has taken University of Chattanooga graduate Thomas Kline, 77, a lifetime to log 85,000 miles on foot, but the former engineer and pharmaceutical company executive has kept meticulous records to prove his steps.
Kline, a retired vice president of Pfizer Inc., has written about his adventures walking in more than 60 countries in a new book called, "Walking 85,000 Miles to Aide Humanity and Have Fun."