Here's a question:
"What invention needs to exist in the next 50 years?"
Interesting question to me. Many people have certain inventions or concepts that they want to exist in the future. Whether it's teleportation, flying cars, hover boards, easy space travel, or what not there always is some idea that people feel needs to exist.
For me, I think a cheap way of desalinating water would be very beneficial for all and should absolutely exist in the near future.
So what about you?
What invention needs to exist in the next 50 years?