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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 bychemistryastronomyClear all

Results

Showing 1 to 1 of 1

NewestMost votedA to Z
Proven

Spectroscopy

Every element absorbs and emits light at a unique set of wavelengths. Reading those wavelengths identifies what something is made of without touching…

byCapsule
0 votes0 reviews
Aug 3, 2026