Bird Songs

In many ways, bird song is a vocal sound similar in nature to the vocalizations of humans and other mammals. Like humans, birds make sound through breathing in and out of two lungs and through the passage of air creating vibrations within a voice box. However, whereas the human voice box, or larynx, is located at the top of the... more »

A doorbell rings because there is a piece of flat metal that presses against a hot wire running beneath the button. When the metal touches it, the circuit is completed and the electrical current races toward the chime box, which is where the noise originates. When the button is released, the circuit is broken again and the noise... more »