Sagan drew this.
She showed me “this is three” with her fingers. I asked, “if you take one finger away, how many do you have left.” She answered “two” even without lowering one finger. Then she got an idea to show me what 3 minus 1 equals 2 looks like and she drew the picture.
That’s all her with no help from me. Sagan just wrote her first math equation.
Also, some new pictures are up as well.