If you could produce a scientific enhancement that would affect everyone on the planet and make the world a better

Question: If you could produce a scientific enhancement that would affect everyone on the planet and make the world a better place, what would it be and why?
- Keywords:
  enhancement,
  world
Asked by PostonA to Agata, Chris, John, Kirstin, Michael on 22 Jun 2016.
- Chris Hackett answered on 22 Jun 2016:
  
  If I could do anything, it would be engineer a single pill which could make humans immune to all diseases and ailments (cancer etc.). I’m not sure how likely such a thing is though, maybe one day 🙂
- John Allport answered on 23 Jun 2016:
  
  I would like to be able to control the weather so that everyone had some sunshine and enough rain to provide water and to grow crops instead of the more and more extreme weather we seem to be getting these days

Question: If you could produce a scientific enhancement that would affect everyone on the planet and make the world a better place, what would it be and why?