People, places, animals, inventions, and more.

Thinkers, leaders, artists, explorers, and memorable fictional figures.

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Animals & Nature

Living creatures and natural subjects with wildly different ways of being in the world.

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Places & Landmarks

Cities, countries, natural wonders, and human-made places with a story to tell.

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Objects & Inventions

Tools, machines, and everyday inventions that changed what people could do.

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History & Culture

Events, traditions, movements, books, and works that shaped shared memory.

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Science & Space

Planets, missions, phenomena, and ideas that help explain the universe.

Mystery library

Nine mysteries to start with

A rotating selection from the complete mystery library.

Browse all answers

Cleopatra

Cleopatra VII was the final active ruler of Ptolemaic Egypt and a major political figure during the Roman Republic's last decades.

African Elephant

The largest living land animal, recognized by its size, ears, trunk, and social life.

Statue of Liberty

The Statue of Liberty is a copper monument on Liberty Island, presented by France and dedicated in New York Harbor in 1886.

World Wide Web

The World Wide Web is a system of linked online information accessed over the Internet through browsers, web addresses, and common standards.

Apollo 11

The 1969 spaceflight that carried the first humans to the Moon’s surface.

Northern Lights

Colorful atmospheric displays produced when energetic particles interact with gases above Earth's northern polar region.

Emperor Penguin

The emperor penguin is the largest penguin species and breeds on Antarctic sea ice during the dark, cold winter.

Airplane

An airplane is a powered fixed-wing aircraft that produces lift as air moves around its wings and thrust moves it forward.

Bald Eagle

The bald eagle is a large North American bird of prey recognized by the white head and tail of mature adults.