The chirp of a cricket. The hum of a refrigerator. The ticking of a grandfather clock. These are just a few of the sounds Krista Stump didn’t know existed until the age of 45. “I didn’t miss them,” she said, “because I didn’t know they were there.” The daughter of an Ohio dairy farmer, Krista never knew she had a hearing problem. In retrospect, she recalls she always sat in front of the class as a child. And, when she began her career as an elementary school teacher, she repeatedly urged her students to, “Speak up!”