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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 byevidenceClear all

Results

Showing 1 to 9 of 9

NewestMost votedA to Z
Fact

The Scientific Method

The set of practices by which scientific claims are tested against evidence. It is not a single fixed procedure, and its most important components…

byCapsule
0 votes0 reviews
Aug 5, 2026
Debunked

Facilitated Communication

A technique in which an assistant supports the hand or arm of a non-speaking person while they type, said to reveal unsuspected literacy. Controlled…

byCapsule0 votes0 reviewsAug 4, 2026
Hypothesis

The Inflammatory Hypothesis of Depression

The proposal that inflammation causes depression in some patients. The evidence is better than for the serotonin account it partly replaced, and the…

byCapsule0 votes0 reviewsAug 3, 2026
Hypothesis

Integrated Information Theory

Giulio Tononi's proposal that consciousness is integrated information, quantifiable as a number called phi, and present wherever that number is above…

byCapsule0 votes0 reviewsAug 3, 2026
Hypothesis

The Glymphatic System

The proposal that the brain flushes waste through a network of fluid-filled channels, and that the flushing happens mainly during sleep. It was…

byCapsule0 votes0 reviewsAug 3, 2026
Hypothesis

The Gut-Brain Axis

The proposal that gut microbes influence mood, behaviour and neurological disease, and that altering them could treat psychiatric and…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

Semmelweis and Handwashing

A Hungarian obstetrician worked out in 1847 that doctors were killing women in childbirth by carrying something on their hands from the dissection…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

The Randomised Controlled Trial

Assign people to treatments by chance, and the groups differ only by chance. It is a simple idea, it is the most reliable method medicine has for…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

Geomagnetic Reversal

The Earth's magnetic field has flipped hundreds of times, north becoming south and back. The record of those reversals is frozen into the ocean…

byCapsule0 votes0 reviewsAug 3, 2026