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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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  • FactTardigrade
  • FactMonarch Butterfly
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The library

Capsules

1,028 capsules, each one classified by the strength of its evidence.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered byreasoningClear all

Results

Showing 1 to 6 of 6

NewestMost votedA to Z
philosophy
Fact

Ethics

The systematic study of how one ought to act. It asks what makes an action right, what makes a life good, and what grounds those judgements, and its…

byCapsule
0 votes0 reviews
statistics
Fact

Probability

The mathematics of uncertainty. It assigns numbers between zero and one to events, and its rules are simple enough to state on a page and produce…

byCapsule0 votes0 reviews
statistics
Fact

Correlation

A statistical measure of how far two variables move together. It is among the most widely used quantities in research and among the most widely…

byCapsule0 votes0 reviews
philosophy
Fact

Logic

The study of valid inference: which conclusions follow from which premises, and why. It is the shared foundation of philosophy, mathematics and…

byCapsule0 votes0 reviews
mathematics
Proven

The Monty Hall Problem

A probability puzzle with a counterintuitive answer, made famous when thousands of people including professional mathematicians insisted publicly…

byCapsule0 votes0 reviews
mathematics
Proven

Bayes' Theorem

A rule for updating a belief when new evidence arrives. It is a short piece of algebra, it is not in any dispute, and misapplying it produces some of…

byCapsule0 votes0 reviews