What thing you made sold the best?

Question: What thing you made sold the best?
- Keywords:
  career,
  engineering,
  money,
  superlative
Asked by Deco to Aislinn, Nathan, Padraic, Sinead on 11 Feb 2015.
- Sinead Quirke answered on 11 Feb 2015:
  
  Hi,
  
  I dont make things, I provide a service. I operate in a monoploy so if you want to fly you need to pay the IAA for a licence.
- Nathan Quinlan answered on 11 Feb 2015:
  
  I haven’t sold a single thing as an engineer! Most of my work is research and analysis and teaching – indirectly, some of it has an influence on the design and manufacture of products.
- Aislinn Coghlan answered on 11 Feb 2015:
  
  Hi Deco,
  
  It depends. When I made petrol and diesel, it made millions of euro a year.
  
  The chocolate factory was the same but the quantity of product was much higher than in the oil refinery.
  
  Where I work now, people need the medicine to stay alive. We don’t think of it as selling a product but as providing people with a better life. However, this makes money too and this helps us research more life saving treatments.

Question: What thing you made sold the best?