Ruth Lawrence became one of the most famous child prodigies in modern history, educated at home by her father, a computer consultant who quit his career to teach her full time. She earned an O level in mathematics at nine, passed the Oxford entrance exam at ten, and entered St. Hugh's College at twelve, with her father attending her lectures and tutorials.

This episode traces her rare transition from a heavily guided media phenomenon to an independent, respected researcher. She graduated at 13 with a congratulatory first, earned a physics degree and a DPhil under Field Medalist Sir Michael Atiyah by 17, and went on to reshape knot theory and algebraic topology while building her own life in the United States and Israel.

• How her parents' background in the logic of early computing shaped an intense homeschooling method
• The  ...