How a Nuclear Reactor Makes Electricity
A reactor splits atoms to release heat, then makes steam to spin turbines. Here is how this controlled chain reaction produces power.
Priya Anand
The library
All explainers
Every explainer we've published, newest first. 30 clear, source-checked explainers on technology, science, engineering, and the internet.
Priya Anand
How Cloud Storage Keeps Your Files Safe and Synced
Your photos in the cloud live on distant servers, copied many times. Here is how cloud storage syncs devices and guards against loss.
Theo Lindqvist
How a Jet Engine Creates Thrust
A jet engine swallows air, squeezes it, burns fuel, and blasts it out. Here is how that cycle pushes a heavy airliner through the sky.
Priya Anand
What Is Quantum Computing, Explained
Quantum computers use the strange rules of physics to tackle hard problems. Here is what qubits are and why they could be powerful.
Theo Lindqvist
How the Power Grid Delivers Electricity to Your Home
From a distant plant to your outlet, electricity crosses a vast network. Here is how the grid balances supply and demand every second.
Priya Anand
Why Ice Floats on Water, Explained
Most solids sink in their own liquid, but ice floats. Here is how the way water molecules lock together makes ice lighter than water.
Mara Voss
How Encryption Protects Your Data, Explained
Encryption scrambles information so only the right person can read it. Here is how keys lock and unlock your messages and files.
Theo Lindqvist
How a Transformer Changes Voltage, Explained
Transformers step electricity up or down so it can travel and be used safely. Here is how two coils trade voltage for current.
Priya Anand
How CRISPR Edits Genes, Explained
CRISPR lets scientists cut and rewrite DNA with precision. Here is how this molecular tool finds the right spot and makes a change.
Mara Voss
How Recommendation Algorithms Decide What You See
Apps suggest what to watch, buy, or read by spotting patterns. Here is how recommendation systems guess what you might like next.
Theo Lindqvist
How a Suspension Bridge Holds Its Weight
Long bridges hang from cables yet carry huge loads. Here is how tension, towers, and anchors share the weight to keep the deck steady.
Priya Anand
What Is a Black Hole, Explained
A black hole is a place where gravity is so strong that light cannot escape. Here is how they form and what the event horizon really means.
Mara Voss
How Bluetooth Pairs and Connects Your Devices
Bluetooth links your gadgets over short-range radio without wires. Here is how pairing, hopping frequencies, and low power keep them talking.
Theo Lindqvist
What Causes Ocean Tides, Explained
The Moon tugs on the sea, and the ocean rises and falls twice a day. Here is how gravity from the Moon and Sun drives the tides.
Mara Voss
How a Search Engine Finds Answers in Seconds
Search engines crawl the web, build an index, and rank results fast. Here is how a query reaches the most relevant pages instantly.
Theo Lindqvist
How QR Codes Store Information in a Square
Those black-and-white squares pack surprising amounts of data. Here is how a camera reads a QR code and recovers it even when damaged.
Theo Lindqvist
How a Heat Pump Heats and Cools Your Home
A heat pump moves heat instead of making it, even from cold air. Here is how one device can both warm and cool a house efficiently.
Priya Anand
How Noise-Cancelling Headphones Silence the World
These headphones fight sound with sound. Here is how microphones and inverted waves cancel out the rumble around you in real time.
Theo Lindqvist
What Causes the Seasons, Explained
It is not distance from the Sun. Here is how Earth's tilt changes the angle of sunlight and gives us summer, winter, and everything between.
Mara Voss
How Touchscreens Sense Your Finger, Explained
Your screen feels taps because your finger changes a tiny electric field. Here is how capacitive touchscreens turn a touch into a command.
Theo Lindqvist
How Image Compression Shrinks Photos Without Ruining Them
A photo file can shrink dramatically yet still look fine. Here is how compression throws away detail your eyes barely notice.
Theo Lindqvist
How GPS Knows Exactly Where You Are
Your phone finds itself using signals from satellites thousands of miles up. Here is how timing and triangulation pin you to a few meters.
Theo Lindqvist
How mRNA Vaccines Work, Explained Simply
mRNA vaccines deliver instructions, not a virus. Here is how a tiny genetic message gets your own cells to build a protective rehearsal.
Mara Voss
How HTTPS Keeps Your Browsing Private, Explained
The padlock in your browser means a secret handshake happened. Here is how HTTPS scrambles your data so eavesdroppers cannot read it.
Theo Lindqvist
How Vaccines Train Your Immune System
A vaccine teaches your body to recognize a threat before it strikes. Here is how this safe rehearsal builds lasting protection.
Mara Voss
How a Large Language Model Works, Explained
Language models predict the next word using patterns learned from text. Here is how that simple idea produces fluent, useful answers.
Theo Lindqvist
How the Internet Actually Works, From Your Device to a Server
A click triggers a journey across cables, routers, and data centers. Here is the plain-English path your request takes around the world and back.
Theo Lindqvist
How Lithium Batteries Store and Release Energy
The battery in your phone shuffles lithium ions back and forth. Here is how charging and discharging actually move energy in and out.
Priya Anand
Why the Sky Is Blue, and Sunsets Are Red
Sunlight is white, yet the sky looks blue. Here is how air scatters light to paint the daytime sky and the evening horizon.
Mara Voss
How Wi-Fi Works, Explained in Plain English
Wi-Fi sends your data through invisible radio waves. Here is how your router, channels, and frequencies actually move information across a room.
Theo Lindqvist