Capsule
DonateLog inCreate account
Menu

Navigation

  • Main page
  • Capsules
  • Learning
  • Mapping
  • Rankings
  • Organizations
  • Create
  • Forums
  • Research

Interaction

  • Messages
  • Verify
  • Help
  • About Capsule

Display

Appearance

Environment

EnvironmentsDefault
Capsule
Log in

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.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered bybiologyClear all

Results

Showing 21 to 40 of 148

NewestMost votedA to Z
psychology
Fact

Emotion

States combining physiological change, expressive behaviour and subjective feeling, arising in response to events that matter to the organism. What…

byCapsule
0 votes0 reviews
molecular biology
Fact

Cell Membranes

The boundary enclosing every cell, formed from a double layer of lipid molecules with proteins embedded in it. It defines what is inside the cell,…

byCapsule0 votes0 reviews
microbiology
Fact

Archaea

A domain of single-celled organisms distinct from both bacteria and eukaryotes. Their recognition as a separate branch of life in 1977 restructured…

byCapsule0 votes0 reviews
biochemistry
Fact

Lipids

A class of biological molecules grouped by not dissolving in water. They store energy, form the boundaries of every cell, and act as signalling…

byCapsule0 votes0 reviews
genetics
Fact

Sex Determination

The mechanisms by which an organism develops as male, female or another form. The systems are far more varied than the mammalian arrangement…

byCapsule0 votes0 reviews
immunology
Fact

Inflammation

The body's response to injury or infection, producing redness, heat, swelling and pain. It is protective and necessary, and when it persists without…

byCapsule0 votes0 reviews
microbiology
Fact

Fungi

A kingdom of organisms distinct from plants and animals, which digest their food externally and absorb it. They decompose most of the world's dead…

byCapsule0 votes0 reviews
immunology
Fact

Antibodies

Proteins produced by the immune system that bind specifically to a target and mark it for removal. Their variety is generated at random before any…

byCapsule0 votes0 reviews
biochemistry
Fact

Metabolism

The complete set of chemical reactions that sustain a living organism. It extracts energy from the environment, builds and maintains structures, and…

byCapsule0 votes0 reviews
microbiology
Fact

Bacteria

Single-celled organisms without a nucleus, present in essentially every environment on Earth, and vastly outnumbering all other forms of life. A…

byCapsule0 votes0 reviews
biochemistry
Fact

Proteins

The molecules that carry out most of the work in a cell. They are built from a common set of twenty amino acids, and what each one does is determined…

byCapsule0 votes0 reviews
genetics
Fact

Chromosomes

The structures into which the DNA of a cell is packaged. They are how an organism's genetic material is organised, divided accurately between…

byCapsule0 votes0 reviews
immunology
Fact

The Immune System

The set of cells, tissues and molecules that defends the body against infection. It operates in two connected layers: a fast general response, and a…

byCapsule0 votes0 reviews
neuroscience
Fact

The Neuron

The cell type that carries and processes signals in the nervous system. Neurons are electrically excitable, connect to one another at junctions…

byCapsule0 votes0 reviews
neuroscience
Contested

Why We Sleep

Sleep is universal among animals with nervous systems, is regulated with precision, and is fatal to eliminate. What it is for remains unresolved, and…

byCapsule0 votes0 reviews
biology
Debunked

Preformationism

The doctrine that an organism exists fully formed in miniature within the egg or the sperm, and that development is merely the enlargement of a…

byCapsule0 votes0 reviews
biology
Debunked

Lysenkoism

The agricultural biology of Trofim Lysenko, adopted as official Soviet doctrine from the 1930s to the mid-1960s, which rejected genetics as a…

byCapsule0 votes0 reviews
biology
Debunked

Recapitulation Theory

Ernst Haeckel's claim that an embryo passes through the adult forms of its ancestors as it develops, summarised as the slogan that ontogeny…

byCapsule0 votes0 reviews
ecology
Theory

Life History Theory

The framework that treats an organism's schedule of growth, reproduction and death as an evolved allocation of limited resources, subject to…

byCapsule0 votes0 reviews
chemistry
Proven

Chirality

The property of an object that cannot be superimposed on its mirror image, as with a left and a right hand. In chemistry it applies to molecules, and…

byCapsule0 votes0 reviews
Previous1234…8Next