Headphones were based off the earpiece and were the only way to listen to electrical audio signals before amplifiers were developed. They were first successfully developed in 1910 by Nathaniel Baldwin. He made them in his kitchen and sold them to the Navy.
The incas don't exist today
Yes it does exist today, but it did not exist until the 1920's.
Slavery did exist in 2004 and still exists today.
yes iis still exist
Olympia, Greece does not exist today.
No it does not
does the caddo tribe still exist today
Yes famine still exist in many parts of the world.
It has not been proven for vampires to have ever existed. However, it is possible that they have existed and may still exist today.
Yes, it does...
Yes.
ya