From super-sized natural wonders and man-made marvels to some of the weirdest, creepiest, and teeny-tiniest sights, we take a ...

High on a bluff above the Irtysh River in northeastern Kazakhstan, a ghost city lies just beneath the grass. From the surface ...

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 ...

Abstract: Window design in overmoded waveguides that achieves both broadband and high power is a challenge in the vacuum electronic devices. Here, a broadband overmoded meta-surface-assisted window ...