Which item, weighing under a gram, became the most expensive stamp ever sold when it fetched $9.48 million at Sotheby's in 2021?

What was the name of the digital cash system created by David Chaum in 1989, often considered the first attempt at electronic money?

🗳 29 votes

Which sunken Spanish galleon, discovered off Colombia in 2015, is often called the 'holy grail of shipwrecks' due to its estimated $17 billion treasure?

🗳 26 votes