Gemstones like precious opal are beautiful to look at and deceivingly complex. As you look at such gems from different angles, you'll see a variety of tints glisten, causing you to question what color ...

EPFL’s 3D printer is one of the fastest in the world. Whereas most 3D printers work by depositing a material layer by layer in a process known as additive manufacturing, the EPFL one uses a volumetric ...