Mellow Marshmallow

This particular tattoo I found on the interwebs is inspired by the Terminator movies. When Bill unveiled his hand tattoo, I liked it but I wished it was a humanoid metal robot hand like this forearm here. But Bill likes bones and skulls, so. It's his hand -- he can do what he wants with it. I would have just like a roboskeleton hand better.

--if they happen, that is. Some are a given (polar ice) and some are not happening (aliens)

Melting polar ice
Alien life
Nuclear war
Huge California earthquake
Nuclear fusion
Creation of life
Cloning a human
A modern plague
AI self-awareness
The fourth dimension
Asteroids
Superconductors that work

The interactive thingy that tells you about these is found here.