Originally Posted by Stephen Hawking on Pink Floyd's "Keep Talking"

For millions of years, man lived just like the animals. Then something happened which released the power of our imaginations. We learned to talk."

Originally Posted by Leo

You mean... YEEEEESSSSSSSSSS!

Critical is worse than serious. It goes, in ascending order...

Undetermined

Good

Fair

Serious

Critical

And they add the words "but stable" to any of those above conditions to denote that they are not crashing.