It is a bit of a cliché to characterize life as a rambling journey on which we can alter our course at any given time—by the slightest turn of the wheel, the wisdom goes, we influence the chain of events and thus recast our destiny with new cohorts, circumstances, and discoveries. But for the most of us, life is nothing like that. Instead, we have a few brief periods when we are offered a handful of discrete options. Do I take this job or that job? In Chicago or New York? Do I join this circle of friends or that one, and with whom do I go home at the end of the night? And does one make time
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