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Capsule of the Day

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 byopticsClear all

Results

Showing 1 to 5 of 5

NewestMost votedA to Z
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…

byCapsule
0 votes0 reviews
Aug 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

The Laser

A device that produces light in which every wave is in step, travelling in one direction at one wavelength. It was built in 1960 with no application…

byCapsule0 votes0 reviewsAug 3, 2026
Theory· Scientific

Metamaterials

A metamaterial gets its properties from its structure rather than its chemistry. By arranging elements smaller than the wavelength of the wave…

byCapsule0 votes0 reviewsAug 3, 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