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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 byContestedstatisticsClear all

Results

Showing 1 to 5 of 5

NewestMost votedA to Z
Contested

The Flynn Effect

Average scores on intelligence tests rose steadily throughout the twentieth century, by roughly three points per decade in the countries with long…

byCapsule
0 votes0 reviews
Aug 3, 2026
Contested

The Great Crime Decline

Violent crime fell steeply across most of the developed world from the early 1990s, in some countries by more than half. The fall is one of the best…

byCapsule0 votes0 reviewsAug 3, 2026
Contested

The Replication Crisis

The replication crisis is the finding that a substantial share of published research results cannot be reproduced when the studies are repeated. It…

byCapsule0 votes0 reviewsAug 3, 2026
Contested

Statistical Significance

Statistical significance is a threshold used to decide whether a result is worth taking seriously. The conventional cutoff, a p-value below 0.05,…

byCapsule0 votes0 reviewsAug 3, 2026
Contested

The Heritability of Intelligence

How much of the variation in measured intelligence is attributable to genetic variation is among the most technically misunderstood questions in…

byCapsule0 votes0 reviewsAug 3, 2026