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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 bylogicClear all

Results

Showing 1 to 4 of 4

NewestMost votedA to Z
Proven

Cantor's Diagonal Argument

A proof that some infinities are larger than others. It is a few lines long, it requires nothing beyond counting, it was violently rejected when…

byCapsule
0 votes0 reviews
Aug 4, 2026
Contested

The Problem of Induction

The problem of induction is the observation that no amount of evidence logically guarantees a general conclusion. That the sun has risen every day so…

byCapsule0 votes0 reviewsAug 2, 2026
Proven· Mathematical Proof

The Halting Problem

The halting problem asks whether it is possible to write a program that can examine any other program, together with its input, and reliably decide…

byCapsule0 votes0 reviewsAug 2, 2026
Proven· Mathematical Proof

Gödel's Incompleteness Theorems

Gödel's incompleteness theorems are two of the most profound and startling results in the history of mathematics and logic. Proven by the Austrian…

byCapsule0 votes0 reviewsJun 20, 2026