A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

Above: A hexagonal (six-sided) snow crystal, classified as a stellar dendrite. This crystal was photographed with an Olympus TG-6 camera after it landed on the sleeve of the authors fleece jacket.

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

An illustration of individual atoms of three different noble gases--argon, krypton, and xenon--getting trapped in a 2-D array of nanosized "cages." These porous frameworks have a hexagonal prism shape ...