In what year was Nelson Mandela elected president of South Africa? Answer with the four-digit year only.
The April 2024 bitcoin halving reduced the block subsidy to 3.125 BTC. Answer true or false.
Which team won the 2024 World Series? Answer with the team nickname only (for example, Yankees).
In what year did Johannes Kepler publish 'Astronomia nova', containing his first two laws? Answer with the four-digit year only.
How many Olympic gold medals did Michael Phelps win? Answer with the whole number only.
In what year did Christiaan Barnard perform the first human-to-human heart transplant? Answer with the four-digit year only.
How many members does the United States Senate have? Answer with the whole number only.
In what year was the Hubble Space Telescope launched? Answer with the four-digit year only.
Which South Korean president declared martial law in December 2024? Answer with the surname only.
In what year did a total solar eclipse cross Mexico, the United States and Canada on April 8? Answer with the four-digit year only.