Niue
Niue is a tiny island nation in the South Pacific, a single coral island east of Tonga, often called The Rock for its raised limestone form. One of…
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Cell Theory
Cell theory is one of the foundational ideas of biology. It holds that all living things are made of cells, that the cell is the basic unit of life,…
The Violin
The violin is a wooden string instrument played with a bow, the highest pitched member of the violin family. Prized for its expressive, singing tone,…
Chess
Chess is a two player strategy game played on a board of sixty four squares with sixteen pieces per side. One of the oldest and most popular games in…
The Olympic Games
The Olympic Games are the world's foremost international sporting event, bringing together thousands of athletes from nearly every nation to compete…
The Human Eye
The human eye is the organ of sight, a remarkable structure that turns light into the images we see. Roughly the size of a ping pong ball, it…
Coffee
Coffee is a brewed drink made from the roasted seeds of the coffee plant, and one of the most popular and widely traded beverages in the world.…
Pompeii
Pompeii was a prosperous Roman city near modern Naples that was buried under volcanic ash when Mount Vesuvius erupted in 79 AD. Frozen in time by the…
The Internet
The Internet is a global system of interconnected computer networks that lets billions of devices around the world communicate and share information.…
Statue of Liberty
The Statue of Liberty is a colossal copper statue on an island in New York Harbor, one of the most famous monuments in the United States and a…
Flat Earth
The idea that the Earth is flat is a debunked belief that the planet is a disc or a plane rather than a sphere. It has been contradicted by…
Plate Tectonics
Plate tectonics is the scientific theory that Earth's outer shell is broken into a set of large, rigid plates that drift slowly over the hotter,…
Photosynthesis
Photosynthesis is the process by which plants, algae, and certain bacteria capture the energy of sunlight and use it to turn carbon dioxide and water…
String Theory
String theory is a theoretical framework that attempts to unify all the forces and particles of nature, including gravity, into a single description.…
Ancient Egypt
Ancient Egypt was one of the world's earliest and longest lasting civilizations, flourishing for roughly three thousand years along the banks of the…
International Space Station
The International Space Station, or ISS, is a large spacecraft in orbit around the Earth that serves as a home and laboratory for astronauts. The…
Miasma Theory
Miasma theory was the belief that diseases such as cholera and the plague were caused by "bad air," a poisonous vapor thought to rise from rotting…
Oprah Winfrey
Oprah Winfrey is an American talk show host, producer, actress, and philanthropist, one of the most influential figures in modern media. Born in 1954…
Andrew Carnegie
Andrew Carnegie was a Scottish American industrialist who led the enormous expansion of the American steel industry in the late nineteenth century…
Octopus
The octopus is a soft-bodied marine animal with eight arms, a bulbous head, and a level of intelligence unmatched among invertebrates. A member of…
The Northern Lights
The northern lights, known scientifically as the aurora borealis, are one of nature's most spectacular displays. Shimmering curtains of green, pink,…