Presidents Day 2015: 12 Things You Didn't Know About Past US Commanders in Chief

The first president to bathe in running water and other facts.

— -- intro: Presidents Day is the federal holiday reserved for honoring the leading men of our country. It’s officially "Washington's Birthday," but the name has evolved informally over the years to honor not just the first president, but all 43 of them.

One Family’s Presidents Day Tradition You Have to See to Believe

quicklist:1title: Martin Van Burentext: Martin Van Buren, the eighth U.S. president, had an interesting nickname during his presidency, Noll says. Many referred to Van Buren as "Old Kinderhook," after his house along the Hudson River in upstate New York. His supporters would shout "OK," for short, in rallies, according to NPR.quicklist:2title: Millard Fillmoretext: Could you ever imagine a bathtub without running water? Neither can we, and apparently neither could the nation's 13th president from 1850 to 1853, Millard Fillmore. Fillmore was the first president to have a bathtub with running water.

quicklist:6title:William Howard Taft text: William Taft, born in 1857, served as the nation's 27th president from 1909 to 1913. During his presidency, Taft was the first president to throw out a pitch during a baseball game. That first pitch was in the 1910 Senator's Opening Day game against the Philadelphia Athletics.

It is said that Taft is also the one who helped to coin the term "seventh-inning stretch." Taft got up during the seventh inning of a game to stretch his legs because he could bear sitting down no more, Professor Noll says. The crowd got up to honor their president, but when the president returned a few minutes later, the crowd followed suit, thus giving the name, the "seventh-inning stretch."

Random fact: It is also said that Hoover’s son, Allan, had pet alligators that wandered around the White House, according to CNN.