Question

 What were the originally materials used to invent head phones?

Answer In some countrys it is because alot of people get killed from that.
http://wiki.answers.com/Q/What_were_the_originally_materials_used_to_invent_head_phones

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What miterials were originally used to make head phones?

Why did Nathaniel Baldawin invent the head phones?

The most important first step in the process is to carefully set the camera down on a flat surface, pick up the instruction/operation booklet that came with it, and read the booklet. There's all ... Read More »
http://wiki.answers.com/Q/Why_did_Nathaniel_Baldawin_invent_the_head_phones

When did John C. Koss invent the in ear head phones?

mobile phone is more harmful bcoz the waves that comes from it can cause heart diseases,memory loss,sleep disorders etc.
http://wiki.answers.com/Q/When_did_John_C._Koss_invent_the_in_ear_head_phones

What if your nano plays both through the head phones and out loud how do you get to play through head phones only?


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