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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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  • FactTardigrade
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The library

Capsules

1,028 capsules, each one classified by the strength of its evidence.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered byFactgravityClear all

Results

Showing 1 to 2 of 2

NewestMost votedA to Z
Fact

Neutron Stars

The collapsed cores left by massive stars, containing more than the Sun's mass within a sphere about twenty kilometres across. They are the densest…

byCapsule
0 votes0 reviews
Aug 5, 2026
Fact· Empirical

Black Hole

A black hole is a region of space where gravity is so intense that nothing, not even light, can escape once it passes a certain boundary. They are…

byCapsule0 votes0 reviewsMar 19, 2026