Tie a trefoil knot in a piece of string, seal the ends together, and try to wiggle it free without cutting. In three-dimensional space, the knot holds firm. Add a fourth spatial dimension, however, ...

Researchers at the Indian Institute of Science Education and Research (IISER) Pune have developed ultra-thin electronic devices using a novel, two-dimensional semiconductor, Bismuth Oxyselenide ...

Welcome to Smithsonian Open Access, where you can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to ...