Topological insulators are materials that are insulating in their interior but can support the flow of electrons on their surface. The underlying cause is time-reversal symmetry: their physics is ...

Deceptive appearance: While bismuth appears to be topological at the surface, this masks the fact that the bulk material is not topological. (Courtesy: Yuki Fuseya) Bismuth has puzzled scientists for ...

The subcutaneous layer is the deepest skin layer. It protects a person’s body and keeps it warm. This layer also provides insulation and protection for vital tissues such as muscles, bones, and ...