If you could invent something only you could invent what would it be?

Question: If you could invent something only you could invent what would it be?
- Keywords:
  invention
Asked by Sofija to Daoud, Jess, Jenny, Jason, Janis, Caitríona on 13 Nov 2019. This question was also asked by view43can.
- Caitríona Sheridan answered on 13 Nov 2019:
  
  I would invent large scale wireless power transfer, this can already be done on a small scale!

Question: If you could invent something only you could invent what would it be?