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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 byProvenphysicsengineeringClear all

Results

Showing 1 to 3 of 3

NewestMost votedA to Z
physics
Proven

The Carnot Cycle

An idealised sequence of four reversible steps that a heat engine could in principle follow, and which no real engine can beat. Its efficiency…

byCapsule
0 votes0 reviews
physics
Proven

Electromagnetic Induction

A changing magnetic field produces an electric current. Michael Faraday demonstrated it in 1831, and essentially all the world's electricity is…

byCapsule0 votes0 reviews
physics
Proven

Archimedes' Principle

A body immersed in a fluid is pushed up by a force equal to the weight of the fluid it displaces. It explains why steel ships float, it is over two…

byCapsule0 votes0 reviews