The Bathtub Hoax was the result of a humor piece written in 1917 by H.L. Mencken. Titled "A Neglected Anniversary," it insinuated that Millard Fillmore popularized the bathtub by installing one in the White House.

Speedwell

The ironically-named Speedwell was the second of two ships meant to take the Pilgrims from Plymouth to Virginia. After it was found to be taking water twice, the passengers were all transferred to the Mayflower and the voyage proceeded without the Speedwell.

Frederic Chopin Airport, located in Warsaw and named after its resident composer (who left the city in 1831, never to return). It was formerly called Okecie Airport. It is the busiest airport in Poland.

St. Louis, Missouri, is located on the eastern border of the state, on the western bank of the Mississippi River (which forms the border with Illinois). The Mississippi, Missouri, and Illinois rivers converge north of the city (thus the flag design); however, the River des Peres is within the city and flows into the Mississippi.

Copperheads was a name given to Northern Democrats who opposed the Civil War and sympathized with the South, so named by their opponents because they were dangerous. Also called Butternuts and Peace Democrats.

United Arab Emirates

The United Arab Emirates is a federation of seven emirates located on the Persian Gulf. It is made up of the capital Abu Dhabi (by far the largest in area), Dubai, Fujairah, Ras al-Khaimah, Sharjah, and Umm al-Quwain (at 62,000 people the least populous of the seven). Here is a mnemonic for them: Apu Doubles Fudge, Rassles Sharks, Um... Quickly.