Notebook-sightings in "The Story of Math" and "The Beauty of Diagrams"

A beautiful green diary belonging to German mathematician Carl Friedrich Gauss, a child prodigy who grew to make important contributions to numerous mathematical fields.  Among the notations in his diary are reportedly "I've made this wonderful discovery, and incidentally a son was born today".

The notebook of Hungarian mathematician Janos Bolyai, who made important contributions to non-Euclidean geometry.  Unfortunately, not only did Gauss refuse to tutor the prodigy, leading him to join the army instead, but he also later found that another mathematician had independently discovered his theorems and published first, leading him to die in relative obscurity.

Handwritten pages from Copernicus's manuscript on the revolution of planets:

Written pages from my idol Isaac Newton.