what was your hardest inventions to build?

Question: what was your hardest inventions to build?
- Keywords:
  build,
  hard,
  invention
Asked by mak2016 to Ajay, Kate, Kuntal, Pip, Reka on 13 Nov 2016. This question was also asked by ammu.
- Ajay Mishra answered on 13 Nov 2016:
  
  I am not an inventor but I am a discoverer. I am trying to discover factors which are responsible to maintain our skin. There are many things known while much more is still unknown. Although its not a rocket science, it is still pretty hard and challenging.

Question: what was your hardest inventions to build?