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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 byelectricityClear all

Results

Showing 1 to 3 of 3

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
chemistry
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 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