The family of Sofia Kovalevskaya was so poor they used pages from math book as wallpaper. I have to note that my father did that trick too (made a poster with

The family of Sofia Kovalevskaya was so poor they used pages from math book as wallpaper. I have to note that my father did that trick too (made a poster with algebraic defs, etc and put it above my study table). I am relatively good at math.