An 11-year-old's bedroom walls were papered floor to ceiling with advanced calculus notes, and instead of finding them intimidating, she found them an invitation. This deep dive traces Sofia Kovalevskaya from a curious child on a Russian estate to the first woman in modern Europe to hold a full professorship.

We explore the mind that could reverse-engineer trigonometry from context alone, the legal and societal barriers she bypassed, and the sheer intellectual force she deployed. Barred from universities and denied a passport without a man's permission, she found a radical workaround and never stopped.

• A fictitious marriage of convenience to legally leave Russia for Germany
• Begging professors for permission to audit and studying in isolation with Weierstrass
• Submitting three groundbreaking dissertations at once as ...