I look around and chuckle sometimes at the elitism we have about
   the past. "They were so stupid then, but look how smart we are
   now!" I think ahead to 100 years from now when a lot of what we
   know will be revised, refined, and a lot of things thrown out
   completely and they'll be saying, "Oh look how stupid they were
   back in 2021!" or whatever year this is.