When the president of the United States does something -- even a small thing -- people tend to notice.
Franklin Roosevelt in 1943 was the first sitting president to fly on an airplane.
And, while Barack Obama is best known for becoming the country's first African-American president, in 2014 he also became the first commander in chief to write a line of computer code, typing: moveForward(100);.
Here are five other presidential firsts. See if you know them:
First to travel out of the country during office
Maybe a cross-Atlantic journey by President John Adams or George Washington?
A train ride up to Canada by Andrew Jackson or Ulysses S. Grant in the 19th century?
It wasn't until the turn of the 20th century that any American president set foot outside the United States during office.
In 1906, Theodore Roosevelt boarded the USS Louisiana and steamed to Panama to inspect construction of the Panama Canal.
Fast-forward 111 years, when President Donald Trump visited more than a dozen countries during his first year in office.
First to be president and vice president without being elected
Plenty of American vice presidents got the top job after a president's death or resignation, but how many became vice president and president without earning a single vote at the ballot box?
When Vice President Spiro Agnew resigned in a tax evasion scandal in 1973, President Richard Nixon appointed Rep. Gerald Ford, R-Michigan, as Agnew's replacement.
A year later, under political pressure by the Watergate scandal, Nixon resigned, making Ford the only commander in chief ever to be president and vice president without ever being elected to office.
Ford lost his bid to remain in the White House to Jimmy Carter in 1976.
First to be born a US citizen
There's been so much buzz in recent years around the American presidency and where a candidate, or his parents, were born that it's spawned the term "birther movement."
Early American presidents had no choice but to be born as foreign citizens -- the United States wasn't yet a country when they were born.
So who was the first American president to actually be a US citizen? That title goes to Martin Van Buren, the country's eighth president.
Born in Kinderhook, New York, on December 5, 1782, Van Buren rose to become a New York governor, US secretary of state and vice president before his election to the White House.
All previous presidents had been born as colonists, making them citizens of Great Britain.
First to hold nonconsecutive terms
Did you guess Franklin D. Roosevelt? Sorry, that's wrong.
While FDR is the only US president to serve more than two presidential terms (something that's no longer allowed, thanks to the 22nd Amendment), he served all four of his terms back to back.
You have to rewind to the 19th century in the years after the Civil War to find the only US president who moved out of the White House, only to return again in a few years.
Former New York Gov. Grover Cleveland served as president No. 22 and No. 24 -- the only commander in chief to serve two nonconsecutive terms.
First to hold regular news conferences
Commanding the airwaves of major television networks is still a powerful way for a POTUS to share important messages with the American people -- yet the presidential news conference actually started decades before TVs became a household item in the 1950s and 1960s.
In March 1913, Woodrow Wilson became the first US leader to hold a presidential news conference.
But make no mistake: These were not the free-wheeling, nonscripted, live question-and-answer sessions that we are accustomed to today. Wilson and the next five US presidents held off-the-record news conferences, meaning they could amend anything they said to the media.
And they certainly weren't broadcast live, even over the radio.
It wasn't until January 1955 that President Dwight Eisenhower held the first televised news conference, ushering in the era of on-the-record presidential press briefings. John F. Kennedy held the first live televised news conference in 1961.
It's no surprise that once presidential news conferences became on the record in the Eisenhower administration, the frequency dropped significantly.