Do you take for granted the information delivered every day via touch? You couldn’t button a shirt or tie shoelaces without touch. You couldn’t hold an egg gently or grip a pen to write. You couldn’t tell which side of the tape is sticky. You couldn’t tell if the stove was hot (until your nose smelled burning skin, that is) and you couldn’t sense a sharp edge or a splinter to avoid injury. How would you tap or scroll your smartphone without? Touchscreens depend on, yes, touch

We have said it before and we’ll say it again—at some point we will know the full story of human evolution. Look at the discoveries that...