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2. South Korea - Wikipedia

   en.wikipedia.org/wiki/South_Korea

   South Korea is a country in East Asia with a population of 51.96 million, of which half live in the Seoul Capital Area. It has a rich and turbulent history, from ancient kingdoms to Japanese colonialism, and a rapid economic development based on trade and globalization.

3. Influenza vaccine - Wikipedia

   en.wikipedia.org/wiki/Influenza_vaccine

   Learn about the different types of influenza vaccines, how they are made, and how they protect against infection by influenza viruses. Find out the history of influenza vaccines, from the 1918 pandemic to the 2009 swine flu outbreak, and their effectiveness and safety.

4. Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Pennsylvania

   Pennsylvania is a state in the northeastern United States with a rich and diverse history, culture, and natural features. Learn about its colonial origins, role in the American Revolution and Civil War, geography, population, state symbols, and more.

5. Hydrogen production - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_production

   Learn how hydrogen is produced by various industrial methods, such as steam reforming, electrolysis, and pyrolysis. Find out the sources of hydrogen, such as fossil fuels, renewable energy, and biomass, and the uses of hydrogen in different sectors.

6. Rheumatoid arthritis - Wikipedia

   en.wikipedia.org/wiki/Rheumatoid_arthritis

   Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints, causing inflammation, pain, and deformity. Learn about the symptoms, causes, diagnosis, treatment, and complications of RA from this comprehensive article.

7. Fantastic Four in film - Wikipedia

   en.wikipedia.org/wiki/Fantastic_Four_in_film

   Learn about the history and reception of the Fantastic Four films, including the 2005 adaptation directed by Tim Story and starring Ioan Gruffudd, Jessica Alba, Chris Evans, Michael Chiklis and Julian McMahon. The film was based on the Marvel Comics superhero team created by Stan Lee and Jack Kirby.