What is your most interesting science fact?

Question: What is your most interesting science fact?
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Asked by Tommy/Bailey to Anais, katy, Lauren, Richard, Stuart on 9 Mar 2016.
- Stuart Atkinson answered on 9 Mar 2016:
  
  Liquid oxygen is blue and it is also magnetic.
- Lauren Laing answered on 9 Mar 2016:
  
  There is enough DNA in an average person’s body to stretch from the sun to Pluto and back. 17 times!!!

Question: What is your most interesting science fact?