Two twisty doughnut shapes solve a 150-year-old geometry puzzle - Boing Boing
science 2026/01/28 12:23:17

Two twisty doughnut shapes solve a 150-year-old geometry puzzle - Boing Boing

Source:Boing Boing
Author:Ellsworth Toohey

Two doughnut-shaped surfaces look completely different but share identical measurements. It took 150 years to find them.