The Great Pyramid of Giza is aligned remarkably close to true north, but how did ancient Egyptian builders achieve such ...

Researchers have invented a new way to align 3D semiconductor chips by shining a laser through concentric metalenses patterned on the chips to produce a hologram. Their work can help to lower the cost ...

Digital 3D scanners are revolutionary tools for measuring changes in orthodontics, periodontics, and tooth wear. While most studies focus on the accuracy of the 3D scanning process, obtaining the ...

When a massive star collapses or two neutron stars collide billions of light-years away, the explosion can unleash a brief, blinding flash of gamma rays. Catching that flash and pinpointing its origin ...

[Left] Semiconductor layers are stacked using concentric metalenses as alignment marks. [Right] Light shines through these marks to project a hologram. The alignment or misalignment of the lenses ...