Thinkabara🔎 Thinkapedia
The kids encyclopedia that answers your questions. Ask anything — or explore a subject. Every answer is checked and ends with a quick quiz.
🦁 Animals
🫀 Human Body
🔬 Science
🍂Why Do We Have Seasons?We have seasons because Earth is tilted. As Earth travels around the Sun, first one half and then the other leans toward the Sun.🧊What Are the States of Matter?Matter is anything that takes up space. On Earth it is mostly found in three states: solid, liquid and gas.📅Why Do We Have Leap Years?A leap year has an extra day, February 29, because Earth takes about 365¼ days to go around the Sun.
🤖 Coding & AI
🧮What Is an Algorithm?An algorithm is a list of step-by-step instructions to solve a problem or finish a task.🌐How Does the Internet Work?The internet is a giant network that connects billions of computers so they can send information to each other.0️⃣What Is Binary Code?Binary is a way to write numbers using only 0 and 1. Computers store everything — words, pictures, music — in binary.
➗ Math
💯How Do You Find a Percent?A percent is a part out of 100. "20 percent" means 20 out of every 100.📐What Is the Pythagorean Theorem?In a right triangle, the two short sides squared add up to the long side squared: a² + b² = c².🍕How Do You Add Fractions?To add fractions, the bottom numbers (denominators) must match. Then you add the top numbers.
✏️ Language Arts
🎨What Is an Adjective?An adjective is a word that describes a noun — how it looks, sounds, feels or how many there are.🧩What Are Prefixes and Suffixes?A prefix is added to the start of a word and a suffix to the end. Both change the word’s meaning.🔁What Is a Synonym?Synonyms are different words that mean the same thing, or almost the same thing — like happy and glad.✍️Is or Are? Was or Were?Use "is" for one thing and "are" for more than one. In the past, "was" is for one and "were" is for more than one.⏪What Is the Past Tense?The past tense tells about something that already happened. Most verbs just add -ed: walk → walked.🔗How Do You Use "Because"?"Because" connects what happened to the reason why. "I stayed inside because it was raining."
📚 Literature
🦊What Is a Fable?A fable is a short story, often with talking animals, that teaches a lesson called a moral.🌈What Is a Metaphor?A metaphor describes something by saying it IS something else: "The classroom was a zoo."📖What’s the Difference Between a Story and a Poem?A story is written in sentences and paragraphs and tells events. A poem is written in lines and stanzas and plays with sound and feeling.
🌍 Geography
🌏What Is the Largest Continent?Asia is the largest continent. It covers about a third of all the land on Earth and has more people than any other continent.⛰️How Are Mountains Made?Most mountains form when giant pieces of Earth’s crust, called plates, push against each other and fold the land upward.🧭Where Is the Equator?The equator is an imaginary line around the middle of Earth, halfway between the North Pole and the South Pole.
🗽 US History
📜What Is the Declaration of Independence?The Declaration of Independence is the document in which 13 American colonies announced they were free from Great Britain. It was adopted on July 4, 1776.🖋️What Is the US Constitution?The Constitution is the supreme law of the United States. It sets up the government and protects people’s rights.
🏺 World History
🖼️What Was the Renaissance?The Renaissance was a time of new ideas in art, science and learning in Europe, from about 1300 to 1600. It started in Italy.🏛️Who Were the Ancient Romans?The Romans built one of the biggest empires in history, starting from the city of Rome in Italy more than 2,000 years ago.
🏛️ Civics & Government
🗳️What Is Democracy?Democracy is a kind of government where the people have the power, usually by voting for their leaders.🏛️What Does Congress Do?Congress is the part of the US government that makes federal laws. It has two parts: the Senate and the House of Representatives.🤝What Are Human Rights?Human rights are basic freedoms and protections that every person has, simply because they are human.🦅What Are the Symbols of the United States?America’s symbols include the flag, the bald eagle, the Statue of Liberty, the Liberty Bell and the national anthem.
🧬 Life Science
🌿What Is Photosynthesis?Photosynthesis is how plants make their own food using sunlight, water and air — and it gives us the oxygen we breathe.🔬What Is a Cell?A cell is the smallest living unit. Every living thing — plants, animals, you — is made of cells.🐍What Is a Food Chain?A food chain shows who eats whom in nature, and how energy passes from the Sun to plants to animals.
⚗️ Chemistry
⚛️What Is an Atom?An atom is a tiny building block of matter. Everything around you — air, water, your body — is made of atoms.🧪What Is pH?pH tells how acidic or basic a liquid is, on a scale from 0 to 14. Pure water is 7, which is neutral.🧂Element or Compound — What’s the Difference?An element is made of just one kind of atom. A compound is made of two or more kinds of atoms joined together.
⚛️ Physics
🍎What Is Gravity?Gravity is the force that pulls things toward each other. It keeps your feet on the ground and the Moon circling Earth.⚡How Is Electricity Made?Most electricity is made in power plants by spinning a magnet inside coils of wire. Moving electric charges then flow through wires to your home.💡How Fast Is Light?Light travels about 186,000 miles every second — the fastest speed in the universe.
🌱 Environment
♻️What Is Recycling?Recycling means turning used things — like paper, cans and plastic bottles — into new things instead of throwing them away.🌡️What Is Climate Change?Climate change is the long-term warming of Earth and the changes in weather that come with it, caused mostly by people burning fuels like coal, oil and gas.🚰How Can We Save Water?Only a tiny part of Earth’s water is fresh water we can use, so small habits like turning off the faucet really help.
🎵 Music
🎼What Are Music Notes?Music notes are symbols that show which sound to play and how long to play it.🥁What Is Rhythm?Rhythm is the pattern of long and short sounds in music. The steady pulse underneath is called the beat.🎹How Does a Piano Work?When you press a piano key, a small felt hammer hits metal strings inside, and the vibrating strings make the sound.
🎨 Art
🎨What Are the Primary Colors?In painting, the primary colors are red, yellow and blue. You can mix them to make many other colors.🟥What Is Abstract Art?Abstract art doesn’t try to show things the way they look. It uses shapes, colors and lines to share a feeling or an idea.🌻Who Was Vincent van Gogh?Vincent van Gogh was a Dutch painter famous for his bright colors and thick, swirling brushstrokes, like in "The Starry Night."
💰 Money & Economics
💵What Is a Budget?A budget is a plan for your money: how much comes in, how much you spend and how much you save.📈What Is Inflation?Inflation means prices go up over time, so the same dollar buys a little less than before.🛒Needs vs. WantsNeeds are things we must have to live — food, water, clothes, a home. Wants are things that are nice to have but we can live without.
🤝 Life Skills
🕊️How Do You Solve an Argument?Arguments happen to everyone. You can solve them by calming down, listening, using "I" messages and finding a fair solution together.👂What Is Active Listening?Active listening means paying full attention to someone and showing them that you understand.🧑🤝🧑How Do You Work Well in a Team?Good teamwork means sharing a goal, splitting the jobs, listening to each other and helping when someone gets stuck.
🏃 Health & PE
🤸Why Should You Warm Up Before Exercise?Warming up gets your muscles, heart and lungs ready to move, which helps prevent injuries.💪How Do Muscles Work?Muscles move your body by getting shorter (contracting) and pulling on your bones.🏅What Is Fair Play?Fair play — or good sportsmanship — means following the rules, respecting everyone and being kind whether you win or lose.
🏆 World Records
🌏Largest Continent: AsiaAsia is the biggest continent — about 17 million square miles, nearly a third of Earth’s land.🦘Smallest Continent: AustraliaAustralia is the smallest continent. It is so small that it is also a single country!🌊Largest Ocean: The PacificThe Pacific Ocean is the biggest and deepest ocean. It is larger than all the land on Earth put together.🧊Smallest Ocean: The ArcticThe Arctic Ocean is the smallest and shallowest ocean. It surrounds the North Pole and is covered by sea ice for much of the year.🏔️Tallest Mountain: Mount EverestMount Everest is the tallest mountain above sea level: 29,032 feet — about 5.5 miles high.🏞️Longest River: The NileThe Nile in Africa is usually called the longest river in the world — about 4,130 miles long.
❓ Curious Questions
Coming soon: 🪐 Space · 🦖 Dinosaurs · 💡 Inventors · 🌎 Countries