This year Earth Day falls on Good Friday, traditionally a day when silence is given special emphasis. With that in mind, you might mark both days by learning more about the “One Square Inch of Silence” movement initiated by Gordon Hempton, an acoustic ecologist. He has spent twenty-five years recording the vanishing sounds of nature and attempting to create “One Square Inch of Silence”—a place totally free of human noise, including planes—at Olympic National Park in Washington and in other national parks. I first read about Hampton in an interview in The Sun magazine. This is highly recommended.