If you could pick something that has already been invented to go back and invent it again what would you pick

Question: If you could pick something that has already been invented to go back and invent it again what would you pick
- Keywords:
  invention
Asked by Bossman123and4Chickenandc to Kath on 9 Nov 2017.
- Kathryn Thomas answered on 9 Nov 2017:
  
  Something that made loads of money…. the car?

Question: If you could pick something that has already been invented to go back and invent it again what would you pick