James Garfield was shot by Charles Guiteau in 1881. This assassination attempt eventually led to Garfield's death. The bullet was lodged near Garfield's spine and could not be located by doctors. What contemporary American scientist and inventor created a metal detector to try (unsuccessfully) locating the bullet for removal?

The Battle of Bunker Hill in Boston was one of the turning points of the American Revolutionary War. Today, you can visit the monument as well as climb the 221-foot granite obelisk which honors the fallen soldiers. Within 20 steps, how many steps does it take to climb to the top?

As per the terms of the 1850 Clayton-Bulwer Treaty, the United States and the United Kingdom agreed to halt colonization efforts in what region?

Widely regarded as the world's first commercial steamboat, Robert Fulton's North River Steamboat began operating in 1807 and is also known by what eight-letter name?

Which American president had such distinct blue eyes and such a cold, stone-faced demeanor that he was popularly known as the "human iceberg?" This man served one term as a US Senator from Indiana and one term as US President.

The portrait of George Washington that appears on $1 bills is based on an unfinished painting begun in 1796 by what American artist?