Juan Ponce de Leon Shadow Files: In Search of the Fountain Of Youth By Dr. Cheryl White • Aug 25, 2016 Lucas Cranach the Elder / This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923. Airs Thursday, August 25, at 7:45 a.m. Commentator Dr. Cheryl White travels into history In Search of the Fountain Of Youth. History Matters: Gulf Stream influenced explorers and still drives economies By Gary Joiner, Ph.D. • Dec 17, 2013 Press Image / LSU Shreveport Commentator Gary Joiner explores the Gulf Stream -- a powerful natural occurrence that changed the course of history and still drives economies today.