A few months ago, even though I’m afraid of heights, I joined the local rock gym. No, I had never been rock climbing before – it just seemed like a fun activity I could do together with my partner. But before we were allowed to climb on our own, we had to pass a series of small tests given by staff at the gym. The first lesson was “mat placement,” i.e., how to move the gym mats right under the highest part of our climb so that if we fell, we wouldn’t get seriously hurt.

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