In this video, we explore a large piece of petrified wood using a waterjet to determine if its appearance is consistent or merely a painted rock. The cutting process reveals the challenges of handling ...

We created the world's sharpest obsidian knife, which outperforms a scalpel, using a 60,000 PSI waterjet to craft an extremely thin blade. This video also features cutting petrified wood. Music by ...

OGALLALA To untrained eyes, a hunk of petrified wood looks like nothing more than a rough old rock. But Howard and Harvey Kenfield look at petrified wood and know all about the surprises that hide ...