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2. List of ISO 3166 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

   Learn about the standard codes for the names of countries and their subdivisions, maintained by the International Organization for Standardization (ISO). Find the ISO 3166-1 alpha-2, alpha-3 and numeric codes, the ISO 3166-2 subdivision codes and the Internet country code top-level domains for each of the 249 countries.

3. Standard Model - Wikipedia

   en.wikipedia.org/wiki/Standard_Model

   The Standard Model is a theory that describes three of the four fundamental forces and classifies all known elementary particles. It includes quarks, leptons, gauge bosons, and the Higgs boson, and has been confirmed by many experiments, but leaves some phenomena unexplained.

4. List of people on the postage stamps of the United States

   en.wikipedia.org/wiki/List_of_people_on_the...

   Learn about the over 800 people who have been featured on US postage stamps, from presidents and explorers to artists and musicians. See their names, years, and brief descriptions of their notability.