The most famous tunnel is the thirty mile "Chunnel" between England and France. The Chunnel is actually two separate tunnels, connected by cross passages.
Cowboys in Western movies sometimes puts their ear to the ground to listen for a stampede or wagon train. Elephants can also communicate by hearing vibrations.
Mantids are some of the most impressive insect predators, regularly snaring other insects or even the occasional lizard, snake or frog.
Humans detect the direction a sound comes from by comparing the difference in time of arrival, or loudness of the sound, so why is there a difference?
Some doctors thought it might be interesting to find out if older people's ears are actually bigger, or if it's just an illusion.
You possibly already know that hearing loss affects millions of Americans every year, but did you know that hearing "gain" is also a widespread problem?
Did you know that earwax actually comes in different varieties? Learn more on this Moment of Science.
You probably imagine that your ears are rather passive, but they can play a surprisingly active role too. Learn more on this Moment of Science.
Have you heard the term otoacoustic emissions? They are the noises that your ears generate and emit. Learn more on this Moment of Science.