People, places, animals, inventions, and more.

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

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

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

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

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

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

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

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

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