Math Breakthrough Helps Your Feng Shui

A Korean mathematician claims to have solved the "moving sofa problem" after 60 years. The problem asks what's the largest shape that can navigate through a 1-meter corridor with a right-angle corner. The solution proves that a phone handset-shaped design from 1992, measuring 2.2195 square meters, is the maximum possible size. The proof took seven years to complete and builds on decades of mathematical work on this geometric optimization problem.