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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 byHypothesisastronomyClear all

Results

Showing 1 to 9 of 9

NewestMost votedA to Z
Hypothesis

The Late Heavy Bombardment

The proposal that the inner solar system was struck by a sudden surge of impacts around 3.9 billion years ago, hundreds of millions of years after…

byCapsule
0 votes0 reviews
Aug 3, 2026
Hypothesis

The Faint Young Sun Paradox

The Sun was about thirty percent dimmer when the Earth was young, which should have left the planet frozen solid. The geological record shows liquid…

byCapsule0 votes0 reviewsAug 3, 2026
Hypothesis

The Giant-Impact Hypothesis

The proposal that the Moon formed from debris thrown off when a Mars-sized body struck the early Earth. It is the standard account, it explains most…

byCapsule0 votes0 reviewsAug 3, 2026
Hypothesis

The Drake Equation

The Drake equation is a famous formula that estimates how many communicating alien civilizations might exist in our galaxy. It is less a precise…

byCapsule0 votes0 reviewsJun 12, 2026
Hypothesis

Panspermia

Panspermia is the hypothesis that life exists throughout the universe and is spread between worlds by space dust, meteoroids, asteroids, and comets.…

byCapsule0 votes0 reviewsMay 17, 2026
Hypothesis

Planet Nine

Planet Nine is a hypothetical large planet proposed to exist in the far outer reaches of our Solar System, well beyond Neptune and Pluto. It has…

byCapsule0 votes0 reviewsApr 18, 2026
Hypothesis

The Rare Earth Hypothesis

The Rare Earth hypothesis proposes that complex, multicellular life, of the kind found on Earth, is extremely rare in the universe, because it…

byCapsule0 votes0 reviewsApr 8, 2026
Hypothesis

The Dyson Sphere

A Dyson sphere is a hypothetical megastructure that an extremely advanced civilization might build around a star to capture a large share of its…

byCapsule0 votes0 reviewsMar 8, 2026
Hypothesis

Wormholes

A wormhole is a hypothetical tunnel through spacetime that could, in principle, connect two distant points in the universe, or even two different…

byCapsule0 votes0 reviewsFeb 26, 2026