Top posts

Every blog post that took off on Hacker News, ranked by the votes of its best submission. 374 posts.

Science & Space
2020
142

Sphere Eversion

Topology is the study of the properties of geometric objects which aren’t changed by continuous deformation. A standard low-grade math joke is that toplogists consider a coffee mug and a doughnut equivalent because they’re both torii—(pauses for laughter)—one can be continuously deformed into the other, called a…