Has anything bad or unexpected happened when you have been using the lazers? If so, what?

Question: Has anything bad or unexpected happened when you have been using the lazers? If so, what?
- Keywords:
  accident,
  experiments,
  lasers
Asked by ambert2003 to Mark on 11 Mar 2014. This question was also asked by phoebeep2003.
- Mark Wallace answered on 11 Mar 2014:
  
  No nothing bad. To see single molecules you don’t need much light, for some experiments around 100000 times less light than from a lightbulb

ambert2003 commented on 12 Mar 2014:

Thanks that’s really cool!!!!!

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Question: Has anything bad or unexpected happened when you have been using the lazers? If so, what?