Donate Log in Create account

Menu

Navigation

Main page
Capsules
Learning
Mapping
Rankings
Organizations
Create
Forums
Research

Interaction

Messages
Verify
Help
About Capsule

Display

Appearance

Environment

EnvironmentsDefault

Navigation

Main page
Capsules
Learning
Mapping
Rankings
Organizations
Create
Forums
Research

Interaction

Messages
Verify
Feedback
Help
About Capsule

Truth Classification

Fact
Theory
Hypothesis
Proven
Contested
Debunked

How classification works

Capsule of the Day

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

New in the Library

FactTardigrade
FactMonarch Butterfly
FactSpider

Capsule

© 2026 Solis Holdings Group Inc. All rights reserved.

Built by Solis Dev, a technology studio operating under Solis Holdings Group Inc.

Policy
Terms of Use
Methodology
Corrections
Non-partisanship
Transparency
Developers
About
Discord
Sitemap

Capsule, the capsule-pill mark, and the clock logo are trademarks of Solis Holdings Group Inc. All content, source code, and design assets are the exclusive property of Solis Holdings Group Inc., unless otherwise noted. Unauthorized reproduction is prohibited.

The library

Capsules

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

All1,028 Fact599 Proven130 Theory89 Hypothesis71 Contested90 Debunked48

geography236 biology88 physics67 history54 medicine45 astronomy33 psychology26 mathematics26 chemistry20 engineering20 astrophysics19 neuroscience19 anthropology18 art18

Filtered bymethod Clear all

Results

Showing 1 to 11 of 11

Newest Most voted A to Z

Correlation

A statistical measure of how far two variables move together. It is among the most widely used quantities in research and among the most widely…

0 votes0 reviews

Aug 5, 2026

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…

byCapsule0 votes0 reviewsAug 5, 2026

The Molecular Clock

The proposal that genetic differences accumulate at a roughly constant rate, so counting them dates the split between two lineages. It transformed…

byCapsule0 votes0 reviewsAug 4, 2026

Spectroscopy

Every element absorbs and emits light at a unique set of wavelengths. Reading those wavelengths identifies what something is made of without touching…

byCapsule0 votes0 reviewsAug 3, 2026

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

X-ray Crystallography

A technique for determining the arrangement of atoms in a solid by firing X-rays at a crystal and reading the pattern they scatter into. It has…

byCapsule0 votes0 reviewsAug 3, 2026

The Replication Crisis

The replication crisis is the finding that a substantial share of published research results cannot be reproduced when the studies are repeated. It…

byCapsule0 votes0 reviewsAug 3, 2026

Proven· Mathematical Proof

Regression to the Mean

Regression to the mean is the tendency for an extreme measurement to be followed by one closer to average, for no reason other than that extremes…

byCapsule0 votes0 reviewsAug 3, 2026

Statistical Significance

Statistical significance is a threshold used to decide whether a result is worth taking seriously. The conventional cutoff, a p-value below 0.05,…

byCapsule0 votes0 reviewsAug 3, 2026

Theory· Scientific

Extreme Event Attribution

Extreme event attribution is the field that answers the question people ask after every flood, heatwave, and storm: did climate change cause this?…

byCapsule0 votes0 reviewsAug 3, 2026

Stratigraphy

Stratigraphy is the study of layers, and the principle that where deposits lie undisturbed the lower ones were laid down before the upper ones. It…

byCapsule0 votes0 reviewsAug 3, 2026