Discovery Lab

PhET Simulations

Interactive physics, chemistry and biology simulations from the University of Colorado.

Scale of the Universe

Interactive zoom from subatomic particles to the observable universe.

Connected Papers

Visual graph showing how academic papers connect to each other.

Earth Nullschool

3D visualization of winds, ocean currents, temperature and particles in the atmosphere.

NASA Eyes

Interactive solar system exploration. Real-time positions of planets, probes and missions.

SOHO Solar Monitor

Real-time images of the sun. Sunspots, flares and solar activity from NASA/ESA.

Solar System Scope

Interactive 3D model of the solar system. Explore planets, orbits and space missions in real time.

Earth Timelapse

See how Earth has changed since 1984. Satellite imagery showing urbanization, deforestation and ice melt.

MotionGen

Design and simulate articulated mechanisms, linkages and robotic arms in 2D. Perfect for educational robotics, manipulator kinematics and automation.

The Evolution of Trust

Interactive game explaining why we trust each other using game theory.

Parable of the Polygons

Simulation about how individual choices can create social segregation.

Asteroid Launcher

Simulation that calculates the impact of an asteroid anywhere on Earth.

Radio Garden

Explore live radio stations from around the world by spinning a globe.

Little Alchemy 2

Combination game: start with 4 basic elements and discover hundreds of materials by combining them.

Fireflies Synchronization

Hypnotic simulation of how fireflies synchronize their flashes. Emergence and self-organization.

Sandspiel

Particle physics sandbox: sand, water, fire and more. Create and destroy tiny worlds.

Complexity Explorables

Collection of interactive simulations about complex systems, chaos, networks and emergence.

Gears Mechanics

Interactive article explaining how gears, gear trains and mechanisms work.

Circuit Simulator

Interactive electronic circuit simulator. Design and test circuits in the browser.

The Wiki Game

Wikipedia navigation game: get from article A to B using only internal links. Free, no account.

Six Degrees of Wikipedia

Find the shortest path between any two Wikipedia articles using only links.

MapCrunch

Teleport to a random Street View anywhere in the world. Discover places without searching.

Zoomquilt

Infinite zoom into a collaborative artwork. Hypnotic and visual. Great for screen backgrounds.

FutureMe

Write a letter to your future self and receive it on the date you choose. Free since 2002, no account.

Real-time Earthquakes

Interactive map of recent earthquakes worldwide from USGS data.

Natural Events (NASA)

Fires, storms, volcanoes and other active natural events on the planet.

World Weather

Current and historical weather anywhere in the world. No usage limits.

Stellarium Planetarium

Virtual planetarium showing stars and planets above your current location.

Marine Traffic

Real-time map of ships worldwide. Track maritime routes, vessel types and active ports.

FlightRadar24

Real-time aircraft on the map. Flight information, routes, airlines and aircraft types.

Wikidata Explorer

Discover surprising connections between concepts using the universal knowledge base.

Book Finder

Search books by topic, author or keyword in the world's largest open catalog.

Classic of the Day

A public domain classic book to read online, recommended daily.

Paper Explorer

Search academic papers, authors and topics in the open global research catalog.

World Economic Data

Explore economic indicators like GDP, inflation and life expectancy by country.

Standard Ebooks

Public domain classics with professional typography and editing. Real editorial quality.

LibriVox

Free audiobooks narrated by volunteers. Thousands of classics from world literature.

Which Book?

Book discoverer by mood, theme and pace. Unconventional recommendations.

Wayback Machine

Internet Archive. See how any website looked from 1996 to today. Essential.

FreeRice

Educational trivia where every correct answer donates rice to the UN. Vocabulary, languages, flags, geography and more.

3D Brain Atlas

Interactive 3D anatomical explorer of the human brain.

Tree of Life

Interactive fractal explorer of the evolutionary tree of all species.

iNaturalist

Identify any animal or plant species with a photo. Network of over 3 million observers.

Tree of Life Web

The complete evolutionary tree of life. Explore the relationship between all living beings.

Zygote Body

Fully interactive 3D human body. Systems, organs and anatomical structures.

iBiology

Biology videos from real researchers at the world's best universities.

Neuroscience News

Latest neuroscience news. Discoveries about the brain in accessible language.

Map of Life

Interactive map of global species distribution. Discover which animals and plants live in each region of the planet.

Explore.org

Live wildlife camera network: bears catching salmon, pandas, eagles and more. Free, no account.

Chronas — Historical Map

Interactive map of world history from 4000 BC to the present.

Windy — Global Winds

Interactive map of winds, temperature, waves and air quality in real time.

The True Size Of

Shows the real size of countries by dragging them on the map. Destroys misconceptions.

Ancient Earth Globe

How Earth looked from 750 million years ago to today. Interactive continental drift.

Ventusky — Global Weather

Interactive weather map with temperature, rain, wind, pressure and air quality.

YouGlish — Pronunciation

Find how any word is pronounced on YouTube by native speakers.

IPA Chart

Interactive IPA chart with audio for every sound in all languages.

Anki

Spaced repetition flashcard system. Learn languages, sciences or anything by memorizing at your own pace.

Language Transfer

Free audio courses with a unique linguistic transfer method. Deep learning without memorization.

Forvo

The largest pronunciation dictionary in the world. Hear how any word is pronounced by native speakers.

Clozemaster

Learn languages in context by completing real sentences. Ideal after a basic level.

WordReference

Reference bilingual dictionary with language discussion forums. The most complete for translations.

DeepL Write

AI writing assistant that improves your style, tone and clarity in multiple languages.

Reverso Context

Contextual translator showing words and phrases in real examples from bilingual texts.

Language Reactor

Browser extension showing dual subtitles on Netflix and YouTube. Essential for learning languages with shows.

Perplexity AI

AI search engine that cites verified sources. Ideal for researching any topic rigorously.

Consensus

Answers questions with evidence from real scientific papers. AI for rigorous science communication.

Elicit

AI research assistant. Automatically analyzes and summarizes academic papers.

Explain Like I'm 5

Explains any complex concept very simply. Useful for science communication articles.

Quick, Draw!

Draw and a Google neural network tries to guess in 20 seconds. Shows how machine learning learns and thinks.

Our World in Data

The best site for visualized global data. Health, poverty, climate, energy and dozens more topics.

Gapminder

Interactive visualizations of world development. Debunks myths about the state of the world.

The Pudding

Visual data journalism. Interactive essays on culture, music, language and society.

OEC - World Trade

Visualize international trade of all countries. Exports, imports, historical evolution.

Worldmapper

Distorted maps where each country's size represents data: population, wealth, health and more.

Europeana

Millions of artworks, manuscripts, maps and photographs of European heritage digitized.

World History Encyclopedia

Free historical encyclopedia with academic-quality articles. From prehistory to the present.

Atlas Obscura

The strangest, most hidden and curious places on the planet. Perfect for complementing articles.

Histography

Visual and interactive timeline of all human history. Millions of events.

OpenHistoricalMap

Collaborative historical map built on OpenStreetMap. Explore how borders and places changed over time.

Stanford Encyclopedia

The most complete philosophy encyclopedia in the world. Free, rigorous and up-to-date.

Philosophy Experiments

Ten interactive thought experiments (trolley problem, religion, identity) based on over 133,000 real responses.

The Marginalian

Deep essays on philosophy, art, science and literature. The best ideas newsletter in the world.

Philosophy Tree

Interactive mind map connecting over 80 philosophical ideas across different historical eras.

Visual Capitalist

Infographics and visualizations on economy, finance and business. Complex data visually.

Global Rich List

Compare your wealth with everyone in the world. Tool to understand global inequality.

Numbeo

Database of quality of life, costs, salaries and crime for thousands of cities worldwide.

IMF Data

Historical economic data from the IMF. Free access to research global trends.

EconArena

Free economics games covering micro, macro and personal finance in interactive format.

Desmos

Interactive graphing calculator. Visualize functions, equations and mathematical transformations in real time.

GeoGebra

Dynamic mathematics: geometry, algebra, calculus and statistics in one interactive platform.

Mathigon

One of the best online educational experiences. Interactive, visual mathematics with storytelling.

Wolfram Demonstrations

Thousands of interactive simulations on math, science, engineering and more. Visual concept exploration.

Setosa — Math Visualization

Visual explanations of statistics, probability and math concepts with interactivity.

Seeing Theory

Interactive probability and statistics course with dynamic visualizations. From Brown University.

Google Arts & Culture

Explore museums, artworks, cultural heritage and virtual exhibitions from around the world.

Incredibox

Interactive beatbox music creator. Drag sounds to create your own compositions. Free on web (paid only on mobile app).

MuseScore

The world's largest sheet music library. Music editor and composer community.

Chrome Music Lab

Experiment with sound and music through visual, interactive experiments.

Music Map

Discover musical artists similar to your favorites. An interactive map of music.

The Public Domain Review

Curated collection of works, images, essays and cultural gems in the public domain.

Patatap

Interactive musical instrument: each key generates a unique sound with a visual animation.

Musicmap

Interactive genealogy of music genres. Discover the history and evolution of music.

Scratch

Visual programming for kids and beginners. Create stories, games and animations with blocks.

Code.org

Free programming courses. From visual puzzles to app and game development.

VisuAlgo

Interactive visualization of algorithms and data structures. Sorting, graphs, trees and more.

Algorithm Visualizer

Visualize algorithms from code. Sorting, searching, graphs and backtracking step by step.

Regex Crossword

Crosswords with regular expressions. Learn regex by solving interactive puzzles.

RegExr

Live regular expression tester with reference, examples and community.

Flexbox Froggy

Interactive game to learn CSS Flexbox. Help a frog reach its lily pad by writing CSS code.

Grid Garden

Interactive game to learn CSS Grid. Water your garden by writing grid code.