Autocomplete and voice control began as features for disabled users. Vint Cerf helped invent email in part to communicate with his deaf wife while at work. OCR, now used by Google Books and Translate to convert print and handwritten text to digital form, was invented to create a reading machine for the blind. Look anywhere around you and you'll find technology originally developed to help underserved populations that now benefits everyone.  
  
What can we learn when we design specifically for a single person, perhaps a dyslexic first-grader or a wheelchair-bound relative, instead of for the "average" person? Hopefully, we can improve not only their lives but the lives of everyone around them.