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DebunkedThe PolygraphThe instrument popularly called a lie detector, which records breathing, blood pressure, pulse and skin conductance dur…

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The library

Capsules

1,028 capsules, each one classified by the strength of its evidence.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered bylightClear all

Results

Showing 1 to 8 of 8

NewestMost votedA to Z
Fact

The Photon

The quantum of the electromagnetic field, the smallest possible amount of light at a given frequency. It has no mass, always travels at the speed of…

byCapsule
0 votes0 reviews
Aug 5, 2026
Fact

Wave-Particle Duality

The finding that light and matter both display wave behaviour in some experiments and particle behaviour in others, and that no single classical…

byCapsule0 votes0 reviewsAug 5, 2026
Proven

Diffraction

The spreading and bending of waves when they meet an obstacle or pass through an opening. It happens to all waves, it is the reason light does not…

byCapsule0 votes0 reviewsAug 4, 2026
Proven

Snell's Law

Light bends when it passes between materials, by an amount fixed by a simple ratio. The rule governs every lens, every fibre optic cable and the…

byCapsule0 votes0 reviewsAug 4, 2026
Proven

Colour Vision

Colour is not a property of light. It is what the visual system computes from the responses of three receptor types, and the computation is what…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

The Double-Slit Experiment

Send particles one at a time through two narrow openings and they build up a pattern that only waves can produce. Watch which opening each one goes…

byCapsule0 votes0 reviewsAug 3, 2026
Theory

Optics

Optics is the branch of physics that studies light: how it travels, how it interacts with matter, and how it can be controlled with lenses and…

byCapsule0 votes0 reviewsJun 11, 2026
Fact· Empirical

Rainbow

A rainbow is a band of colour that appears in the sky when sunlight is bent and split by water droplets in the air. Familiar and beloved across every…

byCapsule0 votes0 reviewsApr 14, 2026