if you could build anything in the world what would it be?

Question: if you could build anything in the world what would it be?
- Keywords:
  build,
  invention
Asked by saoirse.r to David on 17 Nov 2014.
- David Taylor answered on 17 Nov 2014:
  
  I’d like to invent replacement body parts that were as good as the real thing. I’ve helped to improve artificial hip joints and some other parts, but they are still nothing like as good as the human body can make

Question: if you could build anything in the world what would it be?