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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 byindustryClear all

Results

Showing 1 to 7 of 7

NewestMost votedA to Z
Fact

Paper

A sheet of matted plant fibre. It replaced every earlier writing surface because it was far cheaper, and the consequences of cheap writing material…

byCapsule
0 votes0 reviews
Aug 5, 2026
Fact

Textiles

Fabrics made from fibres. Textile production drove the first industrial mechanisation, it remains among the largest manufacturing sectors, and the…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

Mining

Extracting minerals from the ground. Every manufactured object contains material that was mined, the industry has been transformed by scale and…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

Railways

Vehicles running on fixed guided tracks. The essential idea is older than the steam engine, and what railways did to distance, time and settlement…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

Polymers

Molecules built from many repeating units linked in chains. They include most plastics, all proteins and nucleic acids, rubber and cellulose, and…

byCapsule0 votes0 reviewsAug 5, 2026
Fact

Steel

An alloy of iron with a small and controlled quantity of carbon. That small addition transforms a soft metal into the most widely used structural…

byCapsule0 votes0 reviewsAug 5, 2026
Proven

Electrolysis

Using an electric current to drive a chemical reaction that would not happen on its own. It is the reverse of a battery, and it is how aluminium,…

byCapsule0 votes0 reviewsAug 4, 2026