46293 Knowledge Bubbles to explore
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Earth
Earth is the third planet from the Sun and the only one known to have life. It is a rocky planet with a very active surface. The outer layer, called t...
space Level 1
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Human
Humans, or Homo sapiens, are the only living members of our biological group. We evolved in Africa about 300,000 years ago and eventually migrated to ...
life science Level 1
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Human history
Human history began in Africa, where modern humans (Homo sapiens) evolved 300,000 years ago. For a long time, we were hunter-gatherers who moved to fi...
history Level 1
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Life
Life is defined by several important biological processes. These include homeostasis (keeping a steady internal state, like sweating to stay cool), me...
life science Level 1
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Mathematics
Mathematics is a field of study that helps us organize and understand the world through numbers and logic. It is divided into several main areas. Geom...
math Level 1
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Philosophy
Philosophy is the systematic study of big questions about life, knowledge, and right and wrong. The word comes from the Greek "philos" (love) and "sop...
philosophy religion Level 1
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Science
Science is a system for building knowledge about the universe using testable predictions. It is divided into branches. Natural science studies the phy...
physical science Level 1
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Society
A society is a large group of individuals who interact regularly and share the same territory and culture. Societies are built on social relations and...
society Level 1
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Technology
Technology is the use of knowledge to create tools and systems that achieve practical goals. It includes physical objects like machines and "intangibl...
technology Level 1
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The arts
The arts are a huge range of human activities used to express creativity and culture. They are usually divided into three branches. Visual arts includ...
arts Level 1
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Africa
Africa is a massive continent that covers about 20% of the Earth's land area. It is home to nearly 1.4 billion people and is the second-most populous ...
geography Level 2
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Agriculture
Agriculture is the practice of cultivating (growing) crops and raising livestock (animals) for food and other products. It began about 11,500 years ag...
language culture Level 2
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Algebra
Algebra is a branch of mathematics that goes beyond basic arithmetic. While arithmetic uses specific numbers, algebra uses variables (letters like x o...
math Level 2
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Ancient history
Ancient history is the story of humans from the time writing began until about the year AD 500. It is often divided into three parts: the Stone Age, t...
history Level 2
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Animal
Animals belong to a group called Kingdom Animalia. They are made of many cells and usually breathe oxygen. Most animals can move around and reproduce ...
life science Level 2
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Architecture
Architecture is the art and science of designing buildings and other structures where people live, work, or worship. The word comes from the Greek wor...
arts Level 2
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Arithmetic
Arithmetic is the most basic branch of mathematics. It focuses on numbers and the operations we perform with them, such as addition (+), subtraction (...
math Level 2
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Asia
Asia is the world's largest continent, covering about 44 million square kilometers. This is roughly 30% of Earth's land area. It is home to 4.7 billio...
geography Level 2
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Astronomy
Astronomy is the study of objects and events beyond Earth's atmosphere. This includes planets, stars, galaxies, and even explosions like supernovas. [...
space Level 2
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Atmosphere of Earth
Earth's atmosphere is a mix of gases, mostly nitrogen (78%) and oxygen (21%). It is held close to the planet by gravity and gets thinner as you go hig...
earth science Level 2
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Biology
Biology is the natural science that studies life and living organisms. It covers everything from the smallest molecules to entire ecosystems, which ar...
life science Level 2
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Business
Business is the practice of making a living by producing or trading products and services. The main goal is to create profit, which is money earned af...
technology Level 2
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Cell (biology)
Cells are the basic building blocks of all living organisms. They were discovered in 1665 by Robert Hooke, who thought they looked like the small room...
life science Level 2
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Chemical element
A chemical element is a substance made of only one kind of atom. The identifying feature of an element is its atomic number, which is the number of pr...
physical science Level 2