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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 byProvenprovenClear all

Results

Showing 1 to 20 of 49

NewestMost votedA to Z
physics
Proven· Replicated

Ohm's Law

Ohm's law is the basic rule governing electric circuits. It states that the current flowing through a conductor is directly proportional to the…

byCapsule
0 votes0 reviews
mathematics
Proven· Mathematical Proof

The Irrationality of the Square Root of Two

The square root of two, the number which when multiplied by itself gives exactly two, cannot be written as a fraction of two whole numbers. It is, in…

byCapsule0 votes0 reviews
medicine
Proven· Replicated

HIV Causes AIDS

It is established beyond reasonable doubt that AIDS, the acquired immunodeficiency syndrome, is caused by infection with HIV, the human…

byCapsule0 votes0 reviews
chemistry
Proven· Replicated

Water Is H2O

Water is made of molecules, each consisting of two hydrogen atoms joined to a single oxygen atom, the composition captured in the familiar formula…

byCapsule0 votes0 reviews
mathematics
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 reviews
statistics
Proven· Mathematical Proof

The Central Limit Theorem

The central limit theorem is one of the most important results in all of statistics. It explains why the familiar bell shaped curve appears again and…

byCapsule0 votes0 reviews
medicine
Proven· Replicated

Antibiotic Resistance

Antibiotic resistance is the ability of bacteria to survive the drugs designed to kill them. It is one of the most direct and observable examples of…

byCapsule0 votes0 reviews
medicine
Proven· Replicated

The Eradication of Smallpox

Smallpox was one of the deadliest diseases in human history, killing hundreds of millions of people over thousands of years. In 1980 the World Health…

byCapsule0 votes0 reviews
physics
Proven· Replicated

Conservation of Momentum

Conservation of momentum is one of the most fundamental and reliable laws in all of physics. Momentum, the product of an object's mass and its…

byCapsule0 votes0 reviews
mathematics
Proven· Mathematical Proof

The Infinitude of Primes

There are infinitely many prime numbers. This was proven more than two thousand years ago by the Greek mathematician Euclid, in an argument so clear…

byCapsule0 votes0 reviews
astrophysics
Proven· Replicated

Black Holes

A black hole is a region of space where gravity is so intense that nothing, not even light, can escape from within it. Once a purely theoretical…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Equivalence of Mass and Energy

Mass and energy are two forms of the same thing. This is the meaning of the most famous equation in science, which states that the energy contained…

byCapsule0 votes0 reviews
molecular biology
Proven· Replicated

The DNA Double Helix

The double helix is the elegant twisted-ladder shape of the DNA molecule, the chemical that carries the genetic instructions of every living thing.…

byCapsule0 votes0 reviews
earth science
Proven· Replicated

The Spherical Earth

That the Earth is a sphere, very slightly flattened at the poles, is one of the most thoroughly established facts in all of science. It has been…

byCapsule0 votes0 reviews
earth science
Proven· Replicated

Climate Change

Climate change refers to the long term warming of the Earth and the shifts in weather patterns that come with it. That the planet is warming, and…

byCapsule0 votes0 reviews
medicine
Proven· Clinical

mRNA Vaccines

mRNA vaccines are a new type of vaccine that teaches the body to fight a disease by delivering genetic instructions rather than a weakened or…

byCapsule0 votes0 reviews
biology
Proven· Replicated

DNA Fingerprinting

DNA fingerprinting, also called DNA profiling, is a technique that identifies individuals by the unique patterns in their genetic material. Since its…

byCapsule0 votes0 reviews
medicine
Proven· Clinical

Human Blood Types

Human blood comes in different types, determined by molecules on the surface of red blood cells. The discovery of blood types made safe blood…

byCapsule0 votes0 reviews
astrophysics
Proven· Replicated

Gravitational Lensing

Gravitational lensing is the bending of light from distant objects by the gravity of massive bodies that lie in between, which can magnify and…

byCapsule0 votes0 reviews
physics
Proven· Replicated

Radioactive Decay

Radioactive decay is the process by which unstable atomic nuclei spontaneously break down, releasing energy and particles and transforming into other…

byCapsule0 votes0 reviews
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