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Truth Classification

Fact
Theory
Hypothesis
Proven
Contested
Debunked

How classification works

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
FactSpider

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The library

Capsules

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

All1,028 Fact599 Proven130 Theory89 Hypothesis71 Contested90 Debunked48

geography236 biology88 physics67 history54 medicine45 astronomy33 psychology26 mathematics26 chemistry20 engineering20 astrophysics19 neuroscience19 anthropology18 art18

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Results

Showing 121 to 130 of 130

Newest Most voted A to Z

Proven· Clinical

Handwashing Prevents Infection

Washing the hands with soap and water is one of the simplest and most powerful tools in all of medicine for preventing the spread of disease. It is a…

byCapsule

0 votes0 reviews

May 6, 2026

Proven· Replicated

The Age of the Universe

The universe is about 13.8 billion years old. Once a matter of wide uncertainty and heated debate, this figure is now known with remarkable…

byCapsule0 votes0 reviewsApr 25, 2026

Proven· Mathematical Proof

Fermat's Last Theorem

Fermat's Last Theorem states that no three positive whole numbers can satisfy the equation a to the power n, plus b to the power n, equals c to the…

byCapsule0 votes0 reviewsApr 25, 2026

Proven· Clinical

Smoking Causes Cancer

That tobacco smoking causes cancer is one of the most thoroughly established findings in all of medicine. Smoking is the leading preventable cause of…

byCapsule0 votes0 reviewsApr 3, 2026

Proven· Clinical

Pasteurization

Pasteurization is the process of heating a food or drink to a specific temperature for a set length of time in order to kill harmful microorganisms…

byCapsule0 votes0 reviewsMar 1, 2026

Proven· Mathematical Proof

The Four Color Theorem

The four color theorem states that any map drawn on a flat surface can be colored using only four colors in such a way that no two regions sharing a…

byCapsule0 votes0 reviewsFeb 26, 2026

Proven· Replicated

Conservation of Energy

The law of conservation of energy states that energy cannot be created or destroyed, only changed from one form into another. The total amount of…

byCapsule0 votes0 reviewsFeb 22, 2026

Proven· Clinical

Penicillin

Penicillin was the first true antibiotic, a medicine that kills bacteria and cures infections that had once been routinely fatal. Its discovery and…

byCapsule0 votes0 reviewsFeb 18, 2026

Proven· Replicated

The Speed of Light

The speed of light in a vacuum is a fixed, fundamental constant of nature, equal to about 299,792 kilometres per second. It is the fastest speed at…

byCapsule0 votes0 reviewsFeb 7, 2026

Proven· Mathematical Proof

The Pythagorean Theorem

The Pythagorean theorem is one of the most famous results in all of mathematics. It states that in a right angled triangle, the square of the longest…

byCapsule0 votes0 reviewsFeb 5, 2026

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