What is the gray goo nightmare?

If people could create nanomachines, they might be able to help fight diseases on the molecular level. They might even be able to replicate themselves. But what happens if that process gets out of hand?

The Grey Goo Nightmare Scenario

LEGO® DREAMZzz™ review: 71469 Nightmare Shark Ship

Engineering, HowStuffWorks

How GREY GOO Could Destroy *Everything*

Grey Goo for Dummies (nightmare scenarios of nanotech) : r/Futurology

A WHAT in Sheep's Clothing? - UB-10 Nightmare by AgentKirin on

The Gray Goo Apocalypse: Nanobots Go Out of Control

Grey goo nanotechnology, self-replicating nanobots scenario

The Gray Goo The End Of The World Caused By Nanomachines 78400

Mr. Bunker's Conspiracy Time Podcast