What would liquid nitrogen be used for? Any examples?

Question: What would liquid nitrogen be used for? Any examples?
- Keywords:
  liquid nitrogen,
  temperature
Asked by KW to Áine on 18 Nov 2014. This question was also asked by KatieC! :-P.
- Áine Broderick answered on 18 Nov 2014:
  
  making ice cream :), it is used in biochemistry labs to freeze cells

Question: What would liquid nitrogen be used for? Any examples?