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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 byFactenergyClear all

Results

Showing 1 to 9 of 9

NewestMost votedA to Z
chemistry
Fact

The Battery

A device storing energy chemically and releasing it as electric current. It made electricity portable, and its energy density is the constraint…

byCapsule
0 votes0 reviews
engineering
Fact

The Electricity Grid

The network generating, transmitting and distributing electrical power. It is the largest machine ever built, it must balance supply and demand…

byCapsule0 votes0 reviews
quantum physics
Fact

The Photon

The quantum of the electromagnetic field, the smallest possible amount of light at a given frequency. It has no mass, always travels at the speed of…

byCapsule0 votes0 reviews
nutrition
Fact

Carbohydrates

A class of molecules made of carbon, hydrogen and oxygen, comprising sugars, starches and fibre. They are the main energy source in most human diets…

byCapsule0 votes0 reviews
ecology
Fact

Food Webs

The network of feeding relationships in an ecosystem. It describes who eats whom, and because energy is lost at every transfer, it explains why large…

byCapsule0 votes0 reviews
biochemistry
Fact

Metabolism

The complete set of chemical reactions that sustain a living organism. It extracts energy from the environment, builds and maintains structures, and…

byCapsule0 votes0 reviews
engineering
Fact

The Internal Combustion Engine

An engine in which fuel burns inside the working chamber, pushing a piston or turning a rotor directly. It displaced the steam engine because it is…

byCapsule0 votes0 reviews
chemistry
Fact

Combustion

The rapid reaction of a fuel with an oxidant that releases heat and usually light. It is the oldest technology humans control, it still supplies most…

byCapsule0 votes0 reviews
physics
Fact· Empirical

Electricity

Electricity is the flow and presence of electric charge, one of the fundamental forces of nature and the power source of the modern world. From the…

byCapsule0 votes0 reviews