Ari Santillanes’s Reviews > Grunt: The Curious Science of Humans at War > Status Update

Both ‘squeeze’ and ‘pull’ are exaggerations of the motion applied to this trigger. It’s a trivial, tiny movement, the twitch of a dreaming child. So quick and so effortless is it that it’s hard for me to associate it with any but the most inconsequential of acts. Flipping a page. Typing an M. Scratching an itch. Ending a life wants a little more muscle.