In what year did Bulgaria and Romania join the European Union?

In what year was the Maastricht Treaty establishing the European Union signed?

In what year did euro banknotes and coins enter circulation?

How many union republics made up the Soviet Union at the time of its dissolution in 1991?

In what year was the Soviet Union formally dissolved?

How many countries signed the North Atlantic Treaty as founding members of NATO in 1949?

In what year did the Rome Statute of the International Criminal Court enter into force?

In what year was the Rome Statute of the International Criminal Court adopted?

How many permanent members does the United Nations Security Council have?

In what year was the Charter of the United Nations signed in San Francisco?

What is the deployed contract code size limit set by EIP-170, in bytes?

In what year did Uniswap v1 launch on Ethereum mainnet?

At what beacon chain epoch did the Pectra (Prague/Electra) upgrade activate on Ethereum mainnet?

Is Ethereum Classic the continuation of the Ethereum chain that did not apply the DAO hard fork?

At what Ethereum mainnet block number did the London upgrade (EIP-1559) activate?

At what Ethereum mainnet block number did the Gray Glacier upgrade activate?

At what Ethereum mainnet block number did the Istanbul upgrade activate?

At what Ethereum mainnet block number did the Homestead upgrade activate?

In what year was the Ethereum crowdsale (the Ether genesis sale) held?

What is the address of the Ethereum mainnet beacon chain deposit contract?