• Each of the following Presidents served exactly one full term in office (i.e., they did not start in the middle of the term by replacing someone else; they did not leave in the middle of the term through death or resignation; and they did not seek or win reelection). However, one of them served a different number of days than the others. Who, and why?

  John Adams, John Quincy Adams, Martin Van Buren, James K. Polk, Franklin Pierce, James Buchanan, Rutherford B. Hayes, Benjamin Harrison, William Howard Taft, Herbert Hoover, Jimmy Carter, George H.W. Bush

• Each of the following Presidents served exactly two full terms in office. However, one of them served a different number of days than the others. Who, and why?

  George Washington, Thomas Jefferson, James Madison, James Monroe, Andrew Jackson, Ulysses S. Grant, Grover Cleveland, Woodrow Wilson, Dwight Eisenhower, Ronald Reagan, Bill Clinton

(No google, no wikipedia, etc. These both can be figured out.)