no
3 hours straight is not good but it won't ruin your ears. Try not to listen to headphones all day. This will hurt your ears.
to put headphones on your ears is to put the left side of headphones is put headphones away from your ears
Headphones that are good for exercise are the ones that go around your ears and the back of your head, or ones that fully go around your ears. This allows them to stay on longer. Examples are here; http://www.headphone.com/selection-guide/exercise-running.php
Supra-aural headphones are headphones that sit directly on the ears instead of enveloping them, which is what circumaural headphones do.
you don't say anything just pull their headphones out of their ears. Or if you're looking for a more polite approach just tap them or yell near their ears. :)
If you have smaller ears, you should get the ear bud type headphones that will fit directly into your ear.
Ultimate Ears headphones come in just about any color you can find in this universe. Everything from white to black to blue and yellow. They even have glow in the dark headphones.
MDR 7506 Sony headphones are fairly comfortable on your ears. They are fairly expensive, high-end headphones and thus demonstrate superior design and comfort.
Headphones
Headphones aren't bad for your ears if you get the right ones... As long as they fit in your ears comfortably then they should be fine... However sleeping in your headphones is not a good idea at all... After falling asleep in my headphones I eventually grew a blister in my ear and it hurt really bad... Don't sleep in your headphones but as long as you get ones that fit comfortably they aren't bad for you
Pro: headphones are respectful to other Con: the headphones are right in your ears, meaning the volume has more chance of damaging your ear drum
no its better to listen with the speaker because it will start to make scratches in your ears