Without scientific instruments or knowledge to tell them otherwise, you can forgive ancient humans for initially believing the Earth was flat. After all, from a human perspective, the world does appear to stretch out before us without suddenly sloping down like a half-pipe. But while this notion has been thoroughly disproven for centuries, a new kind of flat-versus-curved debate has recently captured academic imagination. And this time, scientists are debating the very shape of the universe itself.
In a paper recently published on the arXiv preprint server, a team of astrophysicists and cosmologists from Ulm University and the University of