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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 byFactchemistrychemistryClear all

Results

Showing 1 to 5 of 5

NewestMost votedA to Z
chemistry
Fact

The Battery

A device storing energy chemically and releasing it as electric current. It made electricity portable, and its energy density is the constraint…

byCapsule
0 votes0 reviews
chemistry
Fact

Combustion

The rapid reaction of a fuel with an oxidant that releases heat and usually light. It is the oldest technology humans control, it still supplies most…

byCapsule0 votes0 reviews
chemistry
Fact

Carbon

The element that forms the backbone of all known life, occurs as both the hardest common substance and one of the softest, and forms more compounds…

byCapsule0 votes0 reviews
chemistry
Fact

Acids and Bases

Two complementary classes of substance, defined by what they do with protons or with electron pairs. The distinction organises a large part of…

byCapsule0 votes0 reviews
chemistry
Fact

Water (H₂O)

Water is a chemical compound with the formula H₂O, consisting of two hydrogen atoms covalently bonded to one oxygen atom. Its bent molecular geometry…

byCapsule0 votes0 reviews