Under the supervision of Dr. Alan Isen in a television studio, who was the first U.S. President to appear in public wearing contact lenses? This occurred during the decade in which contact lenses first had mass appeal thanks to improved manufacturing technology.

What 1862 Civil War battle marked the "high water mark" for the Confederacy in the Western Theater after the Union Army of the Ohio (under Buell) won a tactical victory over the Confederate Army of Mississippi (under Bragg) in the largest battle in Kentucky history?

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?