What is the biggest hurdle you have faced as a scientist?

Question: What is the biggest hurdle you have faced as a scientist?
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Asked by beyoncé to Michael on 20 Nov 2015.
- Michael Kyriakides answered on 20 Nov 2015:
  
  @beyonce – That is a great question and a difficult one to answer. I would say that at the end of the day, my own capabilities are what restrict the success of my research. Other than that, sometimes the lack of money can be a big issue when you want to conduct an experiment!

Question: What is the biggest hurdle you have faced as a scientist?