1. The first Earth Day was held on 22 April 1970. Which US senator founded it?

2. On 22 April 1500, a Portuguese navigator became the first European to reach a large South American country. Name the navigator and the country.

3. A German philosopher was born on 22 April 1724 in a Prussian city he hardly ever left. Name him and the city. What is the city called today, and which country is it in?

4. The leader of the Russian Revolution was born on 22 April 1870. What was his real surname?

5. At noon on 22 April 1889, a gunshot started a race by thousands of settlers to claim free land in what is now a US state. Which state? What were those who sneaked in early called?

6. On 22 April 1915, at the Second Battle of Ypres, the German army made the first large-scale use of a new weapon on the Western Front. What was it?

7. A Spanish queen born on 22 April 1451 completed the conquest of Granada and paid for Columbus's first voyage. Who was she?

8. An English novelist born on 22 April 1707 wrote "The History of Tom Jones, a Foundling". Who was he?

9. An American physicist born on 22 April 1904 led the laboratory that built the first atomic bomb. Name him and the laboratory. Which actor won an Oscar for playing him in 2023?

10. An American actor born on 22 April 1937 holds the record for the most Oscar nominations for a male actor, and won Best Actor for a film set in a psychiatric hospital. Name him and the film.