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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 byearthClear all

Results

Showing 1 to 7 of 7

NewestMost votedA to Z
Fact

The Carbon Cycle

The movement of carbon between the atmosphere, oceans, land and rock. It operates on two timescales that differ by a factor of millions, and human…

byCapsule
0 votes0 reviews
Aug 5, 2026
Fact

Mass Extinctions

Intervals in which a large proportion of species disappeared worldwide in a geologically short time. Five are conventionally recognised in the past…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

The Rock Cycle

The continuous transformation of rock between igneous, sedimentary and metamorphic forms, driven by heat from the Earth's interior and by weathering…

byCapsule0 votes0 reviewsAug 5, 2026
Hypothesis

The Boring Billion

The proposal that Earth spent roughly a billion years, from about 1.8 to 0.8 billion years ago, in near-total stasis: stable climate, stable…

byCapsule0 votes0 reviewsAug 4, 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
Proven

Thermohaline Circulation

A global system of deep ocean currents driven by differences in water density, which itself depends on temperature and salinity. It moves heat around…

byCapsule0 votes0 reviewsAug 3, 2026
Fact· Empirical

The Moon

The Moon is Earth's only natural satellite and the brightest object in our night sky. Large in proportion to its planet and close enough to study…

byCapsule0 votes0 reviewsJan 23, 2026