http://disqus.com/people/ceac0f159bcf0fd285c67eef9d5895f7/enSun, 13 Jul 2008 20:00:58 -0000http://ohgizmo.disqus.com/touched_echo_interactive_exhibit_uses_bone_conduction_technology/#comment-1767524To poster above:<br>The difference that people would hear would vary according to clothing, tissue composition (muscle to fat ratio) and how well they contacted the rail and their ears. Putting you head on the rail would work. That's how you can tell how far away a train is from you.JimSun, 13 Jul 2008 20:00:58 -0000http://modernmechanix.disqus.com/secret_weapons/#comment-3746411Well, Miles, too bad you Nazis lost then isn't it?JimThu, 08 May 2008 19:49:44 -0000