> humans uniquely capable of thrusting or throwing an object with accuracy,
> and grabbing or tackling run-away prey. In the human hand, a stout sharp
> stone or stick becomes a weapon--a knife or spear--far superior any set of
> other carnivore's teeth, fangs or claws.

Riddle...  What land born predatory system moves faster and stealthier
than a cheatah over moderate distances?

A human with a round rock.