Once, when I was taking a morning stroll through the fairytale mountains of Colorado, I suddenly bumped into a predator with glaring eyes and frighteningly large fangs. Luckily for me, it was only a poster. “Warning: Mountain Lion” stated the black letters on the yellow sign, followed by a series of stern instructions: Do not run. Do not look him in the eyes. Spread your arms so that you look bigger. Keep your children close to you.