Have you made any big discoveries?

Question: Have you made any big discoveries?
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Asked by Ellis=mc^2 to Chris, Jess, Harriet, Andy on 10 Mar 2016. This question was also asked by Owen:-).
- Christopher Blanford answered on 10 Mar 2016:
  
  Hi Ellis=m*Chris^2
  
  I’ve made a couple. First, check out the pictures at the bottom of my profile page: http://ias.im/u.108462
  These are called inverse opals. They can control how light moves through them. I thought that they could be used for processing with light rather than electricity (like in computers).
  
  I also found a way to make enzymes for fuel cells (devices that take chemical energy and turn it into electrical energy) work for as long as batteries. I had to stop the experiment because I had algae growing in my test tank!
  
  Chris
- andy chapman answered on 13 Mar 2016:
  
  Not ‘big’ for science, or popular science in general but within my field of expertise, most definitely.
- Jessica Groppi answered on 14 Mar 2016:
  
  Hi!
  
  No big discoveries for me yet.
  
  Jess.
- Harriet Reid answered on 14 Mar 2016:
  
  Not big for many people! I made a big discovery for me and about 10 other people its going to make our research a lot easier!

Question: Have you made any big discoveries?