Browse all answers.

The 16th president of the United States, remembered for leadership during the Civil War.

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

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

Albert Einstein was a theoretical physicist whose work reshaped modern understanding of light, gravity, space, time, energy, and matter.

Amelia Earhart was an American aviation pioneer who set major flying records and disappeared during a 1937 attempt to circle the world.

The American Revolution was the political movement and war through which thirteen British colonies established the independent United States.

The Ancient Olympic Games were a recurring Greek athletic and religious festival held at Olympia in honor of Zeus.

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

Artificial intelligence is a broad field concerned with machine-based systems that generate predictions, content, recommendations, decisions, or other goal-directed outputs.

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

A black hole is an extremely dense astronomical object whose gravity creates a boundary beyond which even light cannot escape.

A marine mammal and the largest animal known to have lived on Earth.

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

The Colosseum is a first-century Roman amphitheatre built by the Flavian emperors for public spectacles in the center of Rome.

A magnetic compass is a navigation instrument whose magnetized needle aligns with Earth's local magnetic field to indicate direction.

An iron landmark in Paris built for the 1889 Exposition Universelle.

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

The fall of the Berlin Wall was the November 1989 opening of border crossings that had divided East and West Berlin for decades.

The giant panda is a black-and-white bear native to mountain forests in central China and specially adapted to eat bamboo.

The Grand Canyon is a vast river-carved landscape in Arizona that exposes an unusually long and visible record of Earth's geologic history.

The world’s largest coral reef system, off the coast of Queensland, Australia.

The Great Wall of China is an extensive network of fortifications built across northern China during many dynasties and historical periods.

The great white shark is a large, wide-ranging ocean predator found mainly in temperate and subtropical seas around the world.

Harry Potter is the fictional young wizard at the center of J. K. Rowling's seven-book fantasy series.

The International Space Station is a crewed research laboratory assembled in orbit through cooperation among several national and international space agencies.

The Komodo dragon is the world's largest living lizard, a powerful predator found naturally on a few Indonesian islands.

A Renaissance artist and investigator known for painting, engineering studies, anatomical drawings, and wide-ranging notebooks.

A light bulb is an electric lamp that produces illumination, with traditional incandescent versions glowing by heating a filament inside glass.

Lionel Messi is an Argentine football forward known for his long Barcelona career, international titles, playmaking, dribbling, and goal scoring.

Machu Picchu is a fifteenth-century Inca settlement set high in Peru's Andes within a protected mountain and tropical-forest landscape.

A pioneering physicist and chemist whose work transformed the study of radioactivity.

Mars is a cold, rocky planet known for its reddish surface, thin atmosphere, enormous volcanoes, deep canyons, and evidence of ancient water.

A microscope is an instrument that enlarges or resolves details too small to examine clearly with unaided human vision.

The Milky Way is the barred spiral galaxy containing our solar system, billions of stars, gas, dust, and a central black hole.

Earth’s natural satellite and the brightest object in the night sky after the Sun.

Mount Everest is the Himalayan peak with the highest elevation above sea level, standing on the border between Nepal and China's Tibet region.

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

A machine for producing many copies of text or images efficiently.

The Renaissance was a European cultural movement marked by renewed interest in classical learning, artistic experimentation, humanism, and investigation of the natural world.

The fictional detective created by Arthur Conan Doyle.

A solar eclipse occurs when the Moon passes between the Sun and Earth and blocks some or all sunlight for observers in certain areas.

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

A steam engine is a machine that uses the pressure or expansion of heated water vapor to produce mechanical motion.

The Taj Mahal is a seventeenth-century white-marble mausoleum complex in Agra, India, commissioned by Mughal emperor Shah Jahan.

Taylor Swift is an American singer-songwriter whose career has crossed country, pop, folk, and alternative music while emphasizing personal storytelling.

A communication invention that carries speech across distance.

The Titanic disaster was the 1912 sinking of a passenger liner after it struck an iceberg during its maiden Atlantic voyage.

Tyrannosaurus rex was a large carnivorous dinosaur that lived in western North America near the end of the Cretaceous Period.

The Venus flytrap is a small carnivorous plant native to coastal wetlands in North and South Carolina.

World War II was a global conflict fought from 1939 to 1945 between the Allied powers and the Axis powers.

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