Not only is it a visually attractive material, but it can easily be worked to create sharp edges, perfect for spearheads, knives, and hand-axes. Snowflake obsidian has been linked by some to ...

Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast prehistoric trade networks that once cut across western North America.

On this week's episode: bone collector caterpillar, dolphins pee on each other, using cars to sample air, and obsidian ...

It’s fine structure means both that it fractures predictably during tool-making and it will produce a razor sharp edge. But, what ultimately makes obsidian so well suited for tracking social relations ...