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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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  • FactTardigrade
  • FactMonarch Butterfly
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The library

Capsules

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

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
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Results

Showing 1 to 3 of 3

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
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