DENVER, Colorado, March 31, 2018 -- The journal Nature recently reported on the oldest known human footprints in North America, 13,000 years old, except that they're about 300 million years younger (according to the evolutionary time scale) than human prints in Pennsylvanian Sandstone in McKee, Kentucky. (Real Science Radio's Bob Enyart took all but two of the following photographs.)
* As Discussed on RSR: Hear this on the March 30, 2018 program broadcast on one of America's top ten most-powerful radio stations, Denver's 50,000-watt AM 670 KLTT/KGOV!
