In what year was Barack Obama first inaugurated as President of the United States?

In what year did Elizabeth II become Queen of the United Kingdom?

In what year was the Eiffel Tower completed?

What is the boiling point of pure water at standard sea-level pressure, in degrees Celsius?

How many voting members does the United States House of Representatives have?

What is the atomic number of oxygen?

In what year was Amazon founded?

How many amendments to the United States Constitution had been ratified as of 2025?

How many amendments make up the United States Bill of Rights?

How many seconds are in one hour?

How many minutes are in one day?

In what year was Microsoft founded?

What is the atomic number of carbon?

In what year was Google founded?

In what year did the Wright brothers make the first powered airplane flight?

In what year were euro banknotes and coins first introduced as cash?

In what year was Magna Carta first sealed?

What is the height of Mount Everest in metres according to the 2020 China-Nepal survey, rounded to the nearest metre?

How many member states did the United Nations have in 2025?

How many states are in the United States?

In what year did the Ethereum mainnet launch?

How many bones are in the typical adult human skeleton?

In what year did Nelson Mandela become President of South Africa?

In what year did the first Apple iPhone go on sale?

What is the exact speed of light in a vacuum, in metres per second, as defined in the SI?