Ask yourself the following question: How would you ring a doorbell? Would you press it with your finger or your thumb?
The odds are that if you are over 25 years old, you would use your index finger.
But when you ask teenagers, you will find they are more likely to use their thumb.
Why? Because that is the finger this messaging generation uses to type all day, every day on their smartphones. As a result, this "Thumb Tribe" has become significantly more dexterous with the....