I work with a woman who has a very good sense of hearing. She says I work with a woman who has a very good sense of hearing. She says that she has ears like a bat. She can hear ultrasound, sound that is too high for most people to hear. Some people in her neighborhood use ultrasound devices to keep cats away. Most people don’t notice the ultrasound, but it really bothers her. She says it’s like listening to someone scratching a blackboard with their fingernails. Because of this, she tries not to walk near those houses. I’m very different. As I get older, I can no longer hear high-pitched sounds. At work, for example, we use a hot water kettle with a whistle, but unless I’m very close, I can’t hear it.