1238 | Science & Nature | Multiple Choice | Easy | What was the name of the first artificial Earth satellite, launched by the Soviet Union in 1957? |
1237 | History | Multiple Choice | Medium | Which of these countries was NOT a part of the Soviet Union? |
1236 | Geography | Multiple Choice | Easy | What name was historically used for the Turkish city currently known as Istanbul? |
1235 | Science & Nature | Multiple Choice | Medium | Who developed the first successful polio vaccine in the 1950s? |