As my kids and I were driving somewhere, my cell phone was connected to the Blue Tooth device in the car. The "hands free" technology allowed me to make a call, albeit on a speakerphone, that was audible throughout the car. I dialed (already an outdated verb in this instance) a telephone number through the Blue Tooth mechanism. After placing the call, I reached a busy signal. Funny, I thought to myself, I hardly reach a "busy" anymore. When the droning busy signal was amplified throughout the car, my daughter in the back seat yelled, "What is that noise!?" "What do you mean, what noise?" I responded, thinking that something might have been wrong with the car. "That noise on your phone, what is that?" What!? Yes, that's right, my 11 year-old had never heard a busy signal in her life and had no idea what it could possibly be. Wow. I explained to her how things worked before "call-waiting" was invented. It se...