user: Why do we grow two sets of teeth?

assistant: It might seem odd to replace a complete set of teeth, but your first set of milk teeth has done its job by the time you are five or six years old. Milk teeth have helped you chew for essential nourishment and learn to talk when it's time for your body to house a more extensive adult set of teeth. You lose milk teeth and get adult teeth.

user: Why is the forum in Rome named the forum?

assistant: The Forum in Rome is the location of the ruins of the ancient city of Rome.  The forum is derived from Latin, meaning rectangular plaza.  The plaza was the center of activity in Rome.  Staging speeches trials and public gatherings.

user: In what year was pickleball invented?

assistant: Pickleball was created in 1965 on Bainbridge Island, Washington.