Mathematicians say knots cannot exist in four-dimensional space because the extra dimension allows a rope to move around itself and untangle, revealing surprising insights into geometry and topology.

You’ve seen the headlines. Now let’s break them open. Sasha-Ann Simons connects you with the people behind the stories: experts, neighbors and newsmakers who shape the city we share. It’s news, ...

We’re unpacking the headlines and making the news make sense. Get connected with local experts, your neighbors and the stories shaping Chicago. March 10, 2026 • During this final week before Primary ...