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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 byProvenastronomyClear all

Results

Showing 1 to 13 of 13

NewestMost votedA to Z
Proven

Tides

The periodic rise and fall of sea level caused by the gravitational pull of the Moon and Sun acting unequally across the Earth. The cause has been…

byCapsule
0 votes0 reviews
Aug 4, 2026
Proven

Spectroscopy

Every element absorbs and emits light at a unique set of wavelengths. Reading those wavelengths identifies what something is made of without touching…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

The Expansion of the Universe

Distant galaxies recede from us, and the further away they are the faster they go. The observation established that the universe has a history rather…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

Neutrino Oscillation

Neutrinos change identity as they travel, converting between three types. The discovery resolved a thirty-year discrepancy in measurements of the Sun…

byCapsule0 votes0 reviewsAug 3, 2026
Proven· Replicated

Black Holes

A black hole is a region of space where gravity is so intense that nothing, not even light, can escape from within it. Once a purely theoretical…

byCapsule0 votes0 reviewsJun 19, 2026
Proven· Replicated

The Spherical Earth

That the Earth is a sphere, very slightly flattened at the poles, is one of the most thoroughly established facts in all of science. It has been…

byCapsule0 votes0 reviewsJun 19, 2026
Proven· Replicated

Gravitational Lensing

Gravitational lensing is the bending of light from distant objects by the gravity of massive bodies that lie in between, which can magnify and…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

The Cosmic Microwave Background

The cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from the early universe. Its…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

Exoplanets

Exoplanets are planets that orbit stars other than our Sun. For centuries their existence was only speculation; today thousands have been confirmed,…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

The Expansion of the Universe

The universe is expanding: the galaxies are, on average, moving apart, and the space between them is stretching. Once a startling discovery, the…

byCapsule0 votes0 reviewsJun 11, 2026
Proven· Replicated

Heliocentrism

Heliocentrism is the understanding that the Earth and the other planets orbit the Sun, rather than the Sun and everything else orbiting the Earth.…

byCapsule0 votes0 reviewsJun 11, 2026
Proven· Replicated

The Age of the Universe

The universe is about 13.8 billion years old. Once a matter of wide uncertainty and heated debate, this figure is now known with remarkable…

byCapsule0 votes0 reviewsApr 25, 2026
Proven· Replicated

The Speed of Light

The speed of light in a vacuum is a fixed, fundamental constant of nature, equal to about 299,792 kilometres per second. It is the fastest speed at…

byCapsule0 votes0 reviewsFeb 7, 2026