Answer:

1. Thomas Jefferson and John Adams died hours apart on the same day: July 4, 1826, the 50th anniversary of American independence.

2. Less than a year before John Wilkes Booth killed Abraham Lincoln, Booth’s brother Edwin saved the life of Lincoln’s eldest son, Robert.

3. Speaking of Robert Lincoln, he was on the scene for not one, not two but three presidential assassinations.

4. The Civil War began in Wilmer McLean’s front yard…and ended in his front parlor.

5. Mark Twain came into the world with Halley’s Comet, and (just like he predicted) he went out with it as well.