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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 byphysicshistoryClear all

Results

Showing 1 to 10 of 10

NewestMost votedA to Z
physics
Fact

Timekeeping

Measuring the passage of time and dividing it into units. Every method works by counting something that repeats regularly, and the history of the…

byCapsule
0 votes0 reviews
physics
Proven

Snell's Law

Light bends when it passes between materials, by an amount fixed by a simple ratio. The rule governs every lens, every fibre optic cable and the…

byCapsule0 votes0 reviews
physics
Proven

Electromagnetic Induction

A changing magnetic field produces an electric current. Michael Faraday demonstrated it in 1831, and essentially all the world's electricity is…

byCapsule0 votes0 reviews
physics
Proven

Archimedes' Principle

A body immersed in a fluid is pushed up by a force equal to the weight of the fluid it displaces. It explains why steel ships float, it is over two…

byCapsule0 votes0 reviews
physics
Proven

X-rays

A form of light too energetic to see, discovered by accident in 1895, which passes through flesh and is stopped by bone. Within months it was in…

byCapsule0 votes0 reviews
physics
Proven

Nuclear Fission

Splitting a heavy nucleus releases about a hundred million times more energy per atom than a chemical reaction. It was discovered by accident in…

byCapsule0 votes0 reviews
physics
Proven

Rutherford Scattering

Firing alpha particles at gold foil and finding that a few bounced back. The result destroyed the prevailing model of the atom, established that…

byCapsule0 votes0 reviews
physics
Proven

The Michelson-Morley Experiment

In 1887 two men in a basement in Cleveland tried to measure the Earth's motion through the medium light was assumed to travel in. They found nothing.…

byCapsule0 votes0 reviews
physics
Debunked

The Caloric Theory

The caloric theory was an explanation of heat, widely accepted into the early nineteenth century, which held that heat is an invisible, weightless…

byCapsule0 votes0 reviews
physics
Debunked

The Luminiferous Aether

The luminiferous aether was a hypothetical substance once believed to fill all of space and to serve as the medium through which light waves…

byCapsule0 votes0 reviews