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 ...

There is a chunk of black obsidian along my yard path, and the blackness is intense, especially on a rainy day. The stone is igneous and comes from a volcanic origin, spewed from the depths by a ...

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 ...