what is the most challenging thing you ever done in science

Question: what is the most challenging thing you ever done in science
- Keywords:
  challenge
Asked by 627fddk27 to Yannis on 16 Nov 2017.
- Ioannis Zabetakis answered on 16 Nov 2017:
  
  trying to write a book and explain in simple terms the science behind the nutritional value of foods and especially fats/lipids 🙂
  
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Question: what is the most challenging thing you ever done in science