- Copenhagen interpretation of quantum mechanics
 - The complementarity principle 
- as opposed to Shahriar Afshar's attempts to refute it :-) - please, this is not a comment about Shahriar's religion but about the achievements of Denmark
 
 - Holger Nielsen et al. 
- realization from 1970 that the dual models described dynamics of strings
 
 - Danish gift baskets
 - Carlsberg beer
 - Tuborg beer
 - LEGO toys & BRIO toys
 - Stokke stuff for babies
 - Bang & Olufsen: audio/video/phone
 - Danish cheese: Fontina, Havarti Creamy, Saga Blue
 - Danish Crown hams (Plumrose USA): DAK etc.
 - Danish foodshop (online)
 - Danish deli food (online)
 - iGourmet (online)
 - Lagermann's - candy
 - Toms and Galle & Jessen chocolate
 - Novo Nordisk - medicine
 - Watco Danish furniture Oil
 - Gevalia coffee
 - Ecco shoes
 - Hummel clothing
 - Arla - company that is hit hardest:
 - owner of Wisconsin's White Clover Dairy (brands: White Clover & Holland Farm)
 - cheeses (Rosenborg, Dofino and Mediterra)
 - Danish Air Transport
 - SAS - Scandinavian Airlines
 - Danish porcelain
 - Dansk dinnerware & glassware
 - Raadvad knives
 - Prince (only for smokers!)
 - Kasper Olsen's blog
 - MadeInDenmark.ORG
 
These are pretty good offers from merely 5 million people, aren't they?