Which UK Prime Minister called the 2016 Brexit referendum? Answer with the surname only.
Who developed the first polio vaccine licensed in the United States in 1955? Answer with the surname only.
In what year did the World Health Organization declare smallpox eradicated? Answer with the four-digit year only.
In what year did the Watergate break-in occur? Answer with the four-digit year only.
How many member countries did NATO have after Sweden joined in March 2024? Answer with the whole number only.
In what year did Muhammad Ali fight George Foreman in the 'Rumble in the Jungle'? Answer with the four-digit year only.
In what year were euro banknotes and coins introduced? Answer with the four-digit year only.
How many electoral votes did Joe Biden win in the 2020 US presidential election? Answer with the whole number only.
Which team won Super Bowl LIX? Answer with the team nickname only (for example 'Yankees').
What is the hardest naturally occurring mineral? Answer with the single word only, in lowercase.
Which former Japanese Prime Minister was assassinated in July 2022? Answer with the surname only.
Who co-wrote 'The Communist Manifesto' with Friedrich Engels? Answer with the surname only.
How many member states does the European Union have as of 2025? Answer with the whole number only.
Margaret Thatcher led the UK Labour Party. Answer true or false.
In what year did the Chernobyl nuclear disaster occur? Answer with the four-digit year only.
How many goals did Wayne Gretzky score in his NHL regular-season career? Answer with the whole number only.
In what year did Usain Bolt set the 100 metres world record of 9.58 seconds? Answer with the four-digit year only.
