The Aztec Empire once hosted an expansive trade network that brought volcanic glass to its capital from right across Mesoamerica, from coast to coast. The largest compositional study of obsidian ...

At a microscopic level, obsidian flakes can be sharper than instruments made of surgical steel. While obsidian tools are generally rarer at archaeological sites than tools made of flint or chert ...

Obsidian – a type of volcanic glass – can produce cutting edges many times finer than even the best steel scalpels. At 30 angstroms – a unit of measurement equal to one hundred millionth of ...

Spanning more than five square miles ... and that contributes to the high quality of the Yellowstone obsidian and the easy transformation into sharper blades, Dr. MacDonald said.

The new Xiaomi MIJIA hair clipper comes with a sharper obsidian head and its pre-sale opens on August 11. The MIJIA Hair Clipper 2 offers a more precise shaving capability than its previous iteration.