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

Geologically-speaking, it shouldn’t be there. Now, researchers may have answered how these artifacts made of obsidian ended up so far away from their point of origin, according to a March 14 ...

Archaeologists have evidence for long-distance trade routes across North America that could totally rewrite previously ...

The obsidian artifacts were traced back to four primary regions, including one in Idaho, one in Wyoming, and two in British Columbia, experts said. Photo by Todd Kristensen Volcanic glass has been ...