Can you hear this tone? Mike Rappaport

There is a sound that only young people can hear.  Now, how would you use it?   This story discusses two ways.   

Update:  Well, it appears that many people in their 40s and 50s can hear the tone.  But I cannot.  More evidence, as if I really needed more, that I am getting old.  I was going to say, “Life is not fair.”  Of course, getting old is as fair as it comes.  Everyone ages and must go through it.  Perfectly fair.  Dying early is what is not fair.