Physics, Plainly.

Physics, Plainly.

Physics without the textbook wall.

Understand the ideas behind difficult physics questions—without needing a physics background first.

Explore physics

Start with a question

If Atoms Are Mostly Empty Space, Why Is Matter Solid?Atomic PhysicsWhat Is the Observer Effect in Quantum Mechanics?Quantum PhysicsWhat Is the Quantum Measurement Problem?Quantum PhysicsWhy Can't Quantum Entanglement Be Used for Faster-Than-Light Communication?Quantum PhysicsWhy Does Time Dilation Happen?RelativityWhy Doesn't an Electron Fall Into the Nucleus?Atomic Physics

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Explore physics

01

Quantum Physics

Understand what measurement, observation, and entanglement really mean.

02

Relativity

Explore how motion, time, light, and gravity reshape our picture of reality.

03

Atomic Physics

Look inside matter and make sense of atoms, electrons, and solidity.

04

Thermodynamics

Build an intuitive picture of heat, entropy, and the direction of change.

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Audio Explainers

Audio Explainer

The Day We Heard Two Black Holes Collide

A story about the first direct detection of gravitational waves, the black-hole merger behind the signal, and how LIGO measured it.

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Why Moving Fast Changes Time

A plain-English audio explanation of why the speed of light stays invariant, why moving clocks accumulate different amounts of time, and what time dilation really means.

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Why Quantum Physics Gets Weird When You Measure It

A plain-English audio explanation of quantum observers, measurement, decoherence, and why entanglement cannot send messages faster than light.

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Our approach

How we explain physics

We begin with the question a reader is actually asking, separate the intuition from the misconception, and add precision only when it helps.

Read our editorial method