In what year did the Chernobyl nuclear disaster occur?

In what year did Albert Einstein publish his theory of special relativity?

How many sides does a hexagon have?

How many chromosomes are in a typical human body cell?

In what year did Martin Luther King Jr. give his 'I Have a Dream' speech?

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 members does the United States Senate have?

How many justices sit on the United States Supreme Court?

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 keys are on a standard modern piano?

In what year was Facebook launched?

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?