Neuronauts Junior Science Lab

How Do Brains Work?
Let's Explore the Brain's Connections!

Did you know your brain has over 86 billion tiny cells called neurons, connected by 100 trillion secret bridges called synapses? Join the Neuronauts crew to discover how scientists map the brain using giant electron microscopes, smart AI robots, and video games!

Read Kid Science Stories Brain Concept Decoder Play Brain Detective

Older explorers (and grown-ups) can read the whole adventure in The Neuronauts Expedition — the same crew, the same science, about 40 minutes, with a citation behind every claim.

Meet Your Brain Explorer Crew

Captain Cortex

The Visionary Navigator

"I guide our spaceship through the giant galaxy of brain cells!"

Axon Andy

The Highway Builder

"I send electric messages super fast across long brain cables!"

Dendrite Dendra

The Signal Catcher

"My tree branches catch incoming messages like baseball mitts!"

Synapse Sam

The Secret Messenger

"I deliver chemical high-fives and pass secret notes between cells!"

Glia Gabby

The Pit Crew & Protector

"I feed, clean, and protect our neurons so they stay happy and fast!"

Want the crew on your desk? They print in plastic. Grab all five figures on one plate — flat relief standees, no supports or brim, plus one stand base (print an extra base for each figure you want standing up at once). If you have a colour printer or a print service, there are also full-colour sculpted figures.

Big Science Discoveries Explained for Kids!

Real scientific landmark papers from our open-access 2,000-paper collection, translated into awesome stories and analogies. Every paper below is linked, so you can go and look at the real thing:

Giant Brain Map Based on: Shapson-Coe et al. (Science 2024) & Kasthuri et al. (Cell 2015) — both free to read

1. The Tiny Brain Sample with 150 Million Connections

The Big Question: What does a piece of the human brain look like if you zoom in 100,000 times?

The Fun Analogy: Imagine taking a high-definition photo of every single grain of sand on a 10-mile beach, and then stacking them all in 3D to see how tiny ant tunnels connect underneath!

What Scientists Did: Scientists took a tiny speck of human cortex (smaller than a sesame seed!) and sliced it into 5,000 ultra-thin sheets—each 1,000 times thinner than a human hair. They combined microscope images with powerful computers to build a detailed 3D map of this tiny brain sample.

Mind-Blowing Fact: In that tiny speck, they found 57,000 cells and 150,000,000 synapses!
How scientists mapped this piece of human brain →
Super-Fast Fly Brain Based on: Dorkenwald et al. (Nature 2024) & Scheffer et al. (eLife 2020) — both free to read

2. Why Is It So Hard to Swat a Tiny Fruit Fly?

The Big Question: How does a fruit fly dodge a flyswatter, do aerial acrobatics, and smell sugar from across the room with a brain the size of a poppy seed?

The Fun Analogy: A fly's brain is like a miniature Formula 1 racecar computer. It computes an escape route in just 5 milliseconds (faster than the blink of an eye)!

What Scientists Did: Through the global FlyWire project, hundreds of scientists and citizen volunteers traced all 140,000 neurons and 50 million synapses of the adult fruit fly brain. They discovered special "ring-shaped" steering circuits that act like the fly's internal compass!

Mind-Blowing Fact: If you stretched out all the wiring in a single fruit fly brain, it would measure about 150 meters (longer than a football field)!
How the whole fly brain got mapped →
AI Robot Detectives Based on: Januszewski et al. (Nature Methods 2018) (behind a paywall) & Turaga et al. (Neural Computation 2010) (free to read)

3. Teaching Smart Computers to Untangle Rainbow Spaghetti!

The Big Question: How do scientists trace millions of tangled brain wires without spending 10,000 years doing it by hand?

The Fun Analogy: Imagine a giant bowl filled with 10,000 cooked rainbow spaghetti noodles all twisted together in a knot. If you pull one end, how do you find where it comes out on the other side?

What Scientists Did: They created Flood-Filling Networks (FFNs) and deep learning algorithms. The AI robot starts inside a single cell and "pours digital paint" that fills up only that exact neuron, following cell membranes and following branches in 3D!

Mind-Blowing Fact: AI robots can trace millions of voxels in seconds, but human "proofreaders" still double-check their work to make sure no noodles were accidentally glued together!
How the AI colours in neurons, and where it goes wrong →
The 302-Neuron Worm Based on: White et al. (1986) (behind a paywall) & Cook et al. (Nature 2019) (free to read)

4. The Tiny Worm That Started the Brain Mapping Revolution!

The Big Question: What was the very first creature whose entire brain wiring was completely mapped?

The Fun Analogy: Solving a 302-piece jigsaw puzzle by hand using printed microscope photos and hand-drawn tracings!

What Scientists Did: In 1986, Sydney Brenner and his team spent over 15 years cutting a 1-millimeter worm named C. elegans into thousands of slices, printing physical photos, and tracing all 302 neurons and 7,000 synapses by hand with colored pens!

Mind-Blowing Fact: Even with only 302 neurons, this worm can find food, remember temperatures, navigate mazes, and back away from danger!
The worm with 302 neurons, in full →
Gamers for Science Based on: Kim et al. (Nature 2014) — free to read

5. How Kids and Video Gamers Mapped the Eye and Brain!

The Big Question: Can playing a 3D puzzle game help discover new brain circuits?

The Fun Analogy: Turning 3D brain tracing into a multiplayer video game where players score points and level up by coloring dendritic branches!

What Scientists Did: Sebastian Seung and team created EyeWire, an online video game played by over 250,000 people from 145 countries (including thousands of students and kids!). By playing 3D coloring cubes, players mapped dozens of new retinal ganglion cells that detect motion!

Mind-Blowing Fact: Citizen scientists playing games reconstructed over 10 meters of delicate retinal circuitry, proving that anyone can be a real neuroscientist!
How anyone can help map brains →

The Brain Explorer Concept Decoder

Read each brain word, its meaning, and an analogy to help you remember it.

Neuron

The Brain's Thinker

What is it? A special cell in your brain that processes thoughts, memories, and senses.

Kid Analogy: A tiny computer chip with arms and antennas that sends electrical text messages!

Axon

The Long Cable

What is it? The long tail of a neuron that carries outgoing electrical signals.

Kid Analogy: A super-fast fiber optic internet cable sending messages across town!

Dendrite

The Signal Antenna

What is it? The tree-like branches on a neuron that receive incoming messages.

Kid Analogy: Tree branches covered in baseball mitts ready to catch incoming balls!

Synapse

The Secret Bridge

What is it? The microscopic gap where two neurons connect and share chemicals.

Kid Analogy: A secret whisper station where cells give each other chemical high-fives!

Glia

The Pit Crew

What is it? Helper cells that support, feed, insulate, and clean neurons.

Kid Analogy: The racecar pit crew that changes tires, fuels up, and protects the engine!

Connectome

The Ultimate Map

What is it? A complete wiring diagram of every single connection in a brain.

Kid Analogy: The ultimate Google Maps satellite view showing every road and driveway in Brain City!

Electron Microscope

The Super-Camera

What is it? A powerful scientific camera that shoots electron beams instead of light.

Kid Analogy: A mega-zoom camera that can see things 100,000 times smaller than a grain of salt!

Proofreading

Detective Work

What is it? Humans checking and fixing mistakes made by computer segmentation robots.

Kid Analogy: Playing spot-the-difference to make sure no cables were glued to the wrong house!

Mini-Challenge

Become a Junior Brain Detective!

Test your brain explorer knowledge with this 3-question quick mission:

Mission 1: What is the name of the tiny secret bridge where two brain cells meet and share messages?

Mission 2: If you stretched out all the electrical wires inside a human brain, how far would they reach?

Mission 3: What do scientists call the helper cells that act like the brain's pit crew to clean and feed neurons?

For Teachers & Parents

Hands-On Classroom Activity

Pipe Cleaner Neurons: Have students build neurons using different colored pipe cleaners—red for axons, green for dendrites, and sparkly beads for synaptic vesicles!

For a ready-made 25-minute lesson with a worksheet, use From Projectome to Synapse.

Real Research Connection

Every story here links to the full explanation on this site, and all of it traces back to our open-access 2,000-paper journal club corpus, where each card carries a beginner summary. Older students can read the whole story in The Neuronauts Expedition.

Play for Real Science

Students can try real 3D proofreading by visiting FlyWire (flywire.ai) or EyeWire (eyewire.org) to see how citizen science discovers brain wiring.