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Capsule of the Day

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 byFactearth-scienceClear all

Results

Showing 1 to 12 of 12

NewestMost votedA to Z
Fact

Weather Forecasting

Predicting atmospheric conditions from measurements of the present state. It became genuinely accurate only in the past few decades, and its…

byCapsule
0 votes0 reviews
Aug 5, 2026
Fact

Soil

The layer of weathered mineral material, organic matter, water, air and organisms covering most land surfaces. It supports essentially all…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

The Atmosphere

The layer of gas held around the Earth by gravity. It supplies the oxygen and carbon dioxide life requires, moderates temperature, blocks harmful…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

The Water Cycle

The continuous movement of water between ocean, atmosphere, land and living things. The quantity is fixed; what changes is where it is and in what…

byCapsule0 votes0 reviewsAug 5, 2026
Fact· Empirical

The Northern Lights

The northern lights, known scientifically as the aurora borealis, are one of nature's most spectacular displays. Shimmering curtains of green, pink,…

byCapsule0 votes0 reviewsMay 28, 2026
Fact· Empirical

Volcano

A volcano is an opening in a planet's crust through which molten rock, gas, and ash erupt from the hot interior to the surface. On Earth they are…

byCapsule0 votes0 reviewsMay 13, 2026
Fact· Empirical

Earthquake

An earthquake is a sudden shaking of the ground caused by the release of energy deep within the Earth. Most are too faint to feel, but the largest…

byCapsule0 votes0 reviewsApr 10, 2026
Fact· Empirical

Lightning

Lightning is a sudden, powerful discharge of electricity in the atmosphere, one of nature's most dramatic and dangerous phenomena. A single bolt can…

byCapsule0 votes0 reviewsApr 3, 2026
Fact· Empirical

Grand Canyon

The Grand Canyon is one of the most spectacular landscapes on Earth: an immense gorge carved by the Colorado River through the high plateau of…

byCapsule0 votes0 reviewsFeb 28, 2026
Fact· Empirical

The Sahara

The Sahara is the largest hot desert on Earth, a sweep of sand, gravel, and bare rock stretching across northern Africa from the Atlantic Ocean to…

byCapsule0 votes0 reviewsFeb 16, 2026
Fact· Empirical

Antarctica

Antarctica is Earth's southernmost continent, a vast, frozen wilderness centred on the South Pole. It is the coldest, driest, windiest, and, on…

byCapsule0 votes0 reviewsJan 31, 2026
Fact· Empirical

Tsunami

A tsunami is a series of enormous ocean waves caused by the sudden displacement of a large volume of water, most often by an undersea earthquake.…

byCapsule0 votes0 reviewsJan 21, 2026