A stethoscope is not a machine but a tool for a doctor. A stethoscope is the most commonly used object in the medical field. Whenever you see a doctor, they will almost always have a stethoscope around their neck. A stethoscope looks kind of like a heart with a tail. At the top of the "heart", there are two ear buds that the doctor puts in his ear. At the end of the "tail" there is a circular object attached called a chestpiece which the doctor puts on your heart. By putting it on your heart, he can hear your heartbeat. This is a very helpful tool because heart and lung problems can be discovered in your body and further actions can be taken.