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 byContestedClear all

Results

Showing 61 to 80 of 90

NewestMost votedA to Z
Contested

Does Language Shape Thought

Does the language we speak shape the way we think? This question, sometimes called linguistic relativity, has fascinated and divided scholars for…

byCapsule
0 votes0 reviews
Jun 12, 2026
Contested

What Killed the Ice Age Megafauna

At the end of the last ice age, many of the world's largest animals, the megafauna, went extinct, from woolly mammoths to giant ground sloths.…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

The Origins of Modern Humans

Where and how our own species, Homo sapiens, arose is a question of intense scientific interest. The broad outline, an African origin, is well…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

Why the Neanderthals Died Out

Neanderthals were a species of ancient humans who lived across Europe and Asia for hundreds of thousands of years before disappearing around 40,000…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

The Nature of Time

Time is one of the most familiar parts of our experience, yet what it really is remains one of the deepest and most contested questions in physics…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

Why Do We Dream

Dreams, the vivid stories the mind plays out during sleep, are universal yet deeply mysterious. That we dream is obvious; why we dream, and what…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

What Caused the Great Dying

The Permian extinction, often called the Great Dying, was the most severe mass extinction in Earth's history, around 252 million years ago, when the…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

What Causes Alzheimer's Disease

Alzheimer's disease is the most common cause of dementia, slowly destroying memory and thinking. That it damages the brain is clear, but what…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

How Birds Navigate

Many birds travel thousands of miles between breeding and wintering grounds, often returning to the very same spot year after year. How they find…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

How the Americas Were Settled

How and when the first people reached the Americas is a genuinely contested question. That humans came from Asia is clear, but the timing and the…

byCapsule0 votes0 reviewsJun 12, 2026
Contested

Why We Age

Why living things grow old and eventually die is one of biology's deep and contested questions. Ageing is nearly universal among complex animals, yet…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

The Cambrian Explosion

The Cambrian explosion was a remarkable burst of evolution, beginning around 540 million years ago, when most of the major groups of animals appeared…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

The Origin of Language

How human language first arose is one of the hardest questions in science. That we alone among animals possess full language is clear; when, how, and…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

Are Animals Conscious?

Whether animals have conscious experiences, an inner life of feelings and awareness, is a deep and genuinely contested question. That many animals…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

The Bronze Age Collapse

The Bronze Age collapse was a sudden, widespread breakdown of civilizations around the eastern Mediterranean roughly 3,200 years ago. Within a few…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

What Causes the Ice Ages

Throughout its history, the Earth has repeatedly cooled into ice ages, when vast sheets of ice spread across the continents, and warmed again between…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

How the Universe Will End

The ultimate fate of the universe is one of the deepest questions in science. Cosmologists have proposed several very different endings, and which…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

What Killed the Dinosaurs

Around sixty six million years ago, the dinosaurs and many other forms of life suddenly vanished in one of the great mass extinctions in Earth's…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

The Origin of the Moon

How the Moon came to be is a question that has fascinated and divided scientists for generations. While one explanation is now favoured, important…

byCapsule0 votes0 reviewsJun 11, 2026
Contested

Renewable Energy and Electrical Grid Stability

Wind and solar generation are non-dispatchable and produce zero rotational inertia, raising legitimate concerns about frequency regulation and…

byCapsule0 votes0 reviewsApr 22, 2026
Previous12345Next