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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 byProvenphysiologyClear all

Results

Showing 1 to 6 of 6

NewestMost votedA to Z
Proven

Muscle Contraction

Muscle shortens because two sets of protein filaments slide past one another, driven by myosin heads that repeatedly attach to actin, pivot, and let…

byCapsule
0 votes0 reviews
Aug 4, 2026
Proven

Blood Clotting

The process that seals a damaged blood vessel, combining a physical plug of platelets with a mesh of fibrin produced by a cascade of enzymes. It has…

byCapsule0 votes0 reviewsAug 4, 2026
Proven

Circadian Rhythms

Almost every organism runs an internal clock with a period of about a day, generated by a molecular feedback loop inside individual cells. It runs…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

Osmosis

Water moves across a membrane from where solutes are dilute to where they are concentrated. It requires no pump and no energy input, it generates…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

The Circulation of the Blood

William Harvey demonstrated in 1628 that blood circulates in a closed loop driven by the heart. He proved it by measurement, against a doctrine that…

byCapsule0 votes0 reviewsAug 3, 2026
Proven

The Action Potential

The electrical pulse a nerve cell uses to signal. It is the unit of communication in every nervous system, its mechanism is understood in…

byCapsule0 votes0 reviewsAug 3, 2026