My wife, who is of childbearing age, is a meticulous person by nature, and she always carries this "rhythm diary," or what we call an "ovulation diary." It's a diary in which her ovulation cycle, body temperature, the day her period started, and even the day she and I tried to conceive were filled in in great detail. However, the other day, while she was on her way home from shopping, it seems she dropped her precious "ovulation diary" somewhere. I frantically searched for it, but I couldn't find it, so I gave up.