If you have ever played with a tuning fork, you know that they are interesting and fun, but they can also be expensive. For this experiment, we will use a regular fork from your kitchen to produce a beautiful tone.
Any time you hear a sound, it is because something is vibrating. Place your fingers against your throat and hum. You will feel your throat vibrate. We usually hear sounds from vibrations that travel through the air, but solids can be much better at carrying vibrations.