All the while there are several objects close at hand that could be used to tighten a screw: a butter knife, a key, or even a dime in your pocket. Because the tendency is to think of those objects in...

All the while there are several objects close at hand that could be used to tighten a screw: a butter knife, a key, or even a dime in your pocket. Because the tendency is to think of those objects in terms of cooking, unlocking, and spending, respectively, we sometimes ignore the less obvious possible uses.