After years of streaming windows and damp patches, one solution changed everything - and it costs just 4p per hour to run.

In May 2025, a claim (archived) circulated online that the tech entrepreneur and former Trump adviser Elon Musk solved an "unsolvable" math problem after a Harvard professor called him "rich but dumb.

A mathematician at Yonsei University, in Korea, claims to have solved the moving sofa problem. Jineon Baek has posted a 100+-page proof of the problem on the arXiv preprint server. Most people who ...