Which Ethereum upgrade in August 2021 introduced EIP-1559? Answer with the name only.
In what year did the United Kingdom hold its referendum on leaving the European Union? Answer with the four-digit year only.
Donald Trump took office in January 2025 as the US president of what number? Answer with the whole number only.
Who became UK Prime Minister in September 2022, before Rishi Sunak? Answer with the surname only.
To which country did Bashar al-Assad flee after his government fell in December 2024? Answer with the country name only.
Who became the European Union's foreign policy chief (High Representative) in December 2024? Answer with the surname only.