For one, it doesn't require mining and two, it is invulnerable to what's known as the "51% attack".
By relying on widespread polygraph tests to "flutter" its employees, the agency believed it was invulnerable to "moles".
The reason mathematicians adopted this method is to insure the certainty of geometry by insuring that it was invulnerable to the criticism that its primitive elements were defined by intuition.
"As soon as one side comes under the illusion that it is invulnerable to a strike from the other side, there immediately arise both a number of conflicts and aggression," Mr. Putin said.
"Once a wild pig is full-grown, it is invulnerable to almost all forms of predators — angry alligators being one possible exception".
IV does not create or market products, so it is invulnerable to the patents of others.
For a while they rocketed up, making me think I was invulnerable.
"I know he thinks he's invulnerable or whatever, but it's hard to see him recovering from this".
Shrek is so blind to beauty that he's invulnerable.
He thinks that he's invulnerable, like his idol, Tom Cruise, in "The Firm".
