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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 byProvenClear all

Results

Showing 101 to 120 of 130

NewestMost votedA to Z
astrophysics
Proven· Replicated

The Bending of Starlight

The bending of starlight is the deflection of light by gravity, predicted by Einstein's general theory of relativity and confirmed during a solar…

byCapsule
0 votes0 reviews
physics
Proven· Replicated

Superconductivity

Superconductivity is a remarkable state in which certain materials, when cooled below a critical temperature, conduct electricity with absolutely no…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Higgs Boson

The Higgs boson is a fundamental particle whose discovery in 2012 confirmed how other particles acquire mass. Long predicted but famously hard to…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Neutrino

The neutrino is a tiny, almost massless subatomic particle that barely interacts with anything, streaming through matter, and through us, in…

byCapsule0 votes0 reviews
astrophysics
Proven· Replicated

The Cosmic Microwave Background

The cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from the early universe. Its…

byCapsule0 votes0 reviews
physics
Proven· Replicated

Brownian Motion

Brownian motion is the random, jittery movement of tiny particles suspended in a fluid, caused by their constant bombardment by the fluid's…

byCapsule0 votes0 reviews
astronomy
Proven· Replicated

Exoplanets

Exoplanets are planets that orbit stars other than our Sun. For centuries their existence was only speculation; today thousands have been confirmed,…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Photoelectric Effect

The photoelectric effect is the release of electrons from a material when light shines on it. Simple to observe yet impossible to explain with older…

byCapsule0 votes0 reviews
astrophysics
Proven· Replicated

Gravitational Waves

Gravitational waves are ripples in the fabric of space and time, set off by some of the most violent events in the universe. Predicted by Einstein a…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Coriolis Effect

The Coriolis effect is the apparent deflection of moving objects, such as air and water, when viewed from a rotating frame like the spinning Earth.…

byCapsule0 votes0 reviews
physics
Proven· Replicated

The Doppler Effect

The Doppler effect is the change in the observed frequency of a wave when its source and the observer move relative to each other. It is why the…

byCapsule0 votes0 reviews
astrophysics
Proven· Replicated

The Expansion of the Universe

The universe is expanding: the galaxies are, on average, moving apart, and the space between them is stretching. Once a startling discovery, the…

byCapsule0 votes0 reviews
physics
Proven· Replicated

Newton's Laws of Motion

Newton's laws of motion are three principles, set out by Isaac Newton in 1687, that describe how objects move under the action of forces. For more…

byCapsule0 votes0 reviews
medicine
Proven· Replicated

The Circulation of Blood

The circulation of blood is the continuous movement of blood around the body, pumped by the heart through a network of vessels. This understanding,…

byCapsule0 votes0 reviews
geology
Proven· Replicated

The Age of the Earth

The Earth is about 4.54 billion years old. This figure, once fiercely debated, is now established with great precision through the radioactive dating…

byCapsule0 votes0 reviews
chemistry
Proven· Replicated

Conservation of Mass

The conservation of mass is the principle that, in any ordinary physical or chemical change, matter is neither created nor destroyed. The total mass…

byCapsule0 votes0 reviews
chemistry
Proven· Replicated

The Periodic Table

The periodic table is the organizing chart of chemistry, arranging all the known chemical elements by their properties. It is one of the most…

byCapsule0 votes0 reviews
astronomy
Proven· Replicated

Heliocentrism

Heliocentrism is the understanding that the Earth and the other planets orbit the Sun, rather than the Sun and everything else orbiting the Earth.…

byCapsule0 votes0 reviews
biology
Proven· Replicated

Photosynthesis

Photosynthesis is the process by which plants, algae, and certain bacteria capture the energy of sunlight and use it to turn carbon dioxide and water…

byCapsule0 votes0 reviews
engineering
Proven

Arc Flash Hazard Mitigation in Industrial Electrical Systems

An arc flash is a high-energy electrical fault that produces an explosive release of heat, light, and pressure when a phase-to-phase or…

byCapsule0 votes0 reviews
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