The global middle class(about 2 billion people) can afford to fly in an airplane once in a while, something only the rich could do 100 years ago. That's worth a

The global middle class(about 2 billion people) can afford to fly in an airplane once in a while, something only the rich could do 100 years ago. That's worth appreciating. Technology has never advanced symmetrically for everyone and it likely never will. The only recent tech I can think of that reached everyone rich and poor alike near simultaneously is smart phones.