Duels, Penn and Ganymede

Lincoln once dueled a political enemy with broadswords. After the duel, the two became friends.

Q: Which half of the comedy duo Penn & Teller comes from Pennsylvania?
A: Teller, of course. If it was Penn, it wouldn't be funny.

Jupiter's moon Ganymede is larger than Mercury or Pluto. If it orbited the Sun independent of Jupiter, it would be considered a planet.