What is your favourite investigation so far of human behavoiur and why ?

Question: What is your favourite investigation so far of human behavoiur and why ?
- Keywords:
  preference,
  research
Asked by nicola01 to Jono on 16 Jun 2013.
- Jono Bone answered on 16 Jun 2013:
  
  Hi Nichola,
  
  Do you mean investigations I’ve done myself or investigations that I have read about?
  
  Jono

Question: What is your favourite investigation so far of human behavoiur and why ?