By throwing rocks
You get a rock and start throwing it at a boulder. They imitate you
and do the same. You watch them for a few minutes- then one hits you
on the side of the head. You find a large roll of masking tape in your
even larger pocket and make a target on the boulder. You point to the
target, and hit it with a rock. After a few more blows on the head,
they start to actually hit the target. After a few hours, their arms
start getting tired. Should you make them keep on going, or let them
rest? One rubs her tummy, as if she is hungry. Another
groans.
