Sorry, past Presidents, but you'll likely be forgotten within 50 to 100 years! New research published in Science found that less than 20 percent of people can remember more than the last eight presidents in the order they served. Also, fewer than 25 percent of Americans can remember more than the first five presidents in order. "By the year 2060, Americans will probably remember as much about the 39th and 40th presidents, Jimmy Carter and Ronald Reagan, as they now remember about our 13th president, Millard Fillmore," says study co-author Henry L. Roediger III, PhD, a human memory expert at Washington University in St. Louis. The study involved presidential-recall tests given to college students in 1974, 1991, 2009 and 2014.