How close have scientists got absolute zero?

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Tags

1. #scientists
2. #first
3. #before
4. #gotten
5. #nanokelvin
6. #temperature
7. #below
8. #billionth
9. #close
10. #lower
11. #degree
12. #record
13. #absolute
14. #times
15. #which
16. #cooled
17. #previous