hi, I would like to know about headphones. 
Headphones which are worn over the ears allow people to listen to audio privately without disturbing others
really, how do they accomplish that?
They convert electronic signals to sound. They're pretty cool!
oh my. I would have never guessed. Are there different types of headphones? 
Yes! You can use earbuds to plug inside your ears, instead of over your ears
wow, I wonder when those first came about...
I think around the time of the radio revolution. When it was trendy
oh, I guess that makes sence. 
Yep. Developed ithe late 1800s for phone operators to free their hands