Use of Time
The concept of toughness:
Meaning, toughness is, grosso modo, resistance to injury&ability to bitch-slap.
Another meaning is being a thug (which was not the meaning intended here).
And YES, being invulnerable to everything and able to snuff out a species by snapping one's fingers IS toughness. At least by comparison to the snuffed out species.
Snuffing out a cockroack so easily makes you a LOT tougher than the cockroack.
Contrary to the perception in this thread, the concept is far larger than the hollywood image of two alpha males looking cool and trading punches.