Why does a Moscow Mule have to be in a copper cup?

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Tags

1. #scientific
2. #centuries
3. #drinkers
4. #cocktail
5. #offer
6. #copper
7. #temperature
8. #drinks
9. #metal
10. #extra
11. #using
12. #known
13. #quickly
14. #chilled
15. #sensation
16. #moscow
17. #benefit
18. #taking