In June of 1867 — a few months before Alaska would become part of the United States with the transfer of $7.2 million to Russia — William Healey Dall picked up a shiny black rock from a riverbank.

Obsidian is perhaps best known in its role as the dark black blade atop ancient spears and axes – but what if we wanted to add a little bit of pizzaz to our prehistoric weaponry? Look no further than ...

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture. Tom has a Master's degree in Journalism. His editorial work ...

Holly has a degree in Medical Biochemistry from the University of Leicester. Her scientific interests include genomics, personalized medicine, and bioethics.View full profile Holly has a degree in ...