An Excerpt from Eula Biss’s No-Man’s-Land (February 2008):

IN THE WATER

My love of swimming in open water, in lakes and oceans, is tempered only by my fear of what I cannot see beneath those waters. My mind imagines into the depths a nightmare landscape of grabbing hands and spinning metal blades and dark sucking voids into which I will be pulled and not return. As a charm against my terror of the unseen I have, for many years now, always entered the water silently repeating to myself this command: Trust the water. And for some time after an incident in which one of my feet brushed the other and I swam for shore frantically in a gasping panic, breathing water in the process and choking painfully, I added: Don’t be afraid of your own feet.

I am accustomed to being warned away from the water, to being told that it is too cold, too deep, too rocky, that the current is too strong and the waves are too powerful. Until recently, what I learned from these warnings was only that I could safely defy them all. But then I was humbled by a rough beach in Northern California where I was slammed to the bottom by the surf and dragged to shore so forcefully that sand was embedded in the skin of my palms and my knees. That beach happened to have had a sign that read how to survive this beach, which made me laugh when I first arrived, the first item in the numbered list being do not go within 500 feet of the water.

It is only since I have discovered that some warnings are legitimate that my fears of open water have become powerful enough to fight my confidence in my own strength. I tend to stay closer to shore now, and I am always vigilant, although for what, exactly, I do not know. It is difficult to know what to be afraid of and how cautious to be when there are so many imagined dangers in the world, so many killer sharks, and so many creatures from the Black Lagoon.

Now that we share a bookshelf, I am in possession of my husband’s dog-eared, underlined copy of Barry Glassner’s The Culture of Fear. Every society is threatened by a nearly infinite number of dangers, Glassner writes, but societies differ in what they choose to fear. Americans, interestingly, tend to be most preoccupied with those dangers that are among the least likely to cause us harm, while we ignore the problems that are hurting the greatest number of people. We suffer from a national confusion between true threats and imagined threats.

And our...