1. On 25 February 1964, Cassius Clay won the world heavyweight title in Miami Beach when Sonny Liston failed to come out for which round?

2. Before that fight, Clay promised to "float like a butterfly" and to do what else?

3. On 25 February 1570, a pope issued the bull "Regnans in Excelsis", excommunicating Elizabeth I. Which pope?

4. On 25 February 1956, Nikita Khrushchev gave his "Secret Speech" denouncing Stalin. At which numbered Congress of the Soviet Communist Party did he give it?

5. On 25 February 1986, Ferdinand Marcos fled the Philippines after the "People Power" revolution. Who replaced him as president, and what was his wife Imelda notorious for having left behind in huge numbers?

6. On 25 February 1601, a former favourite of Elizabeth I was beheaded at the Tower of London after leading a failed rebellion. Give his title.

7. On 25 February 1836, Samuel Colt was granted a US patent for what?

8. Czechoslovakia's Communists took full power on 25 February 1948. Weeks later, the non-Communist foreign minister was found dead beneath a window. Who was he?

9. On 25 February 1932, Adolf Hitler was finally granted German citizenship, allowing him to stand for president. Of which country had he originally been a citizen?

10. A musician born on 25 February 1943 organised the Concert for Bangladesh in 1971 and released the triple album "All Things Must Pass". Who was he?

11. A French Impressionist born in Limoges on 25 February 1841 painted "Bal du moulin de la Galette". Name him, and say what his son Jean became famous for.

12. An Italian tenor born in Naples on 25 February 1873 was one of the first great stars of recorded music. Who was he?

13. An American playwright died in New York on 25 February 1983. Which of his plays features Blanche DuBois and Stanley Kowalski?

14. A German writer born on 25 February 1842 wrote hugely popular westerns about an Apache chief and his German blood brother, although he had never been to the American West when he wrote them. Name the writer, the chief and the blood brother.

15. A Venetian playwright born on 25 February 1707 wrote "The Servant of Two Masters". What was the title of Richard Bean's 2011 English adaptation, set in Brighton?

16. The youngest of the Marx Brothers, born on 25 February 1901, appeared in their first five films before becoming an agent and engineer. By what name was he known?

17. An English actor born in Hull on 25 February 1937 starred in "The Loneliness of the Long Distance Runner" and played the title role in which 1963 film about a daydreaming undertaker's clerk?

18. An English pianist born on 25 February 1890 organised daily lunchtime concerts at the National Gallery throughout the Second World War, and was made a Dame. Who was she?

19. On 25 February 1870, Hiram Revels became the first African American to sit in the US Congress, as a senator for which state?

20. On 25 February 1990, Violeta Chamorro won the presidential election in Nicaragua, defeating which Sandinista leader?