James Buchanan was the only president to not have been married. His niece, named Harriet Lane, took over as First Lady.
The candy, Baby Ruth, was named after the birth of Grover Cleveland’s daughter, Ruth.
Abraham Lincoln, who invented a hydraulic device for lifting ships over shoals, was the only president ever granted a patent.
Harry Truman was the first U.S. president to travel underwater in a modern submarine.
Former First Lady Barbara Bush’s great-great-great-uncle was President Franklin Pierce, 14th U.S. president.