Marvin Minsky: What makes mathematics hard to learn? (2008)
> Anecdote: I asked a certain 6-year-old child “how much is 15 and 15”and she quickly answered, “I think it’s 30.” I asked how she figured that out so fast and she replied, “Well, everyone knows that 16 and 16 is 32, so then I subtracted the extra two 1’s.”<p>Wait, is this girl some kind of base-2 native?