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Truth Classification

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Verified consensus.

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Proposed framework.

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Rigorous verification.

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Evidence in conflict.

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Capsule of the Day

ProvenThe Cosmic Microwave BackgroundThe cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from…

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  • FactTaxation
  • FactUrban Parks
  • FactSacred Texts

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Featured capsule

Theory· Scientific

General Relativity

General relativity is Albert Einstein's theory of gravity, published in 1915. It reimagines gravity not as a force pulling objects together but as the curvature of spacetime itself: mass and energy bend the geometry of…

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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 cancer and of death worldwide, responsible for the great majority of…

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Theory· Scientific

Evolution by Natural Selection

Evolution by natural selection is the scientific theory that explains how the diversity of life arose and continues to change. It holds that organisms vary, that some of this variation is inherited, and that individuals…

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Fact· Historical

Leonardo da Vinci

Leonardo da Vinci was an Italian polymath of the High Renaissance whose range across art and science has made his name a byword for genius. Born in 1452 near the town of Vinci, he was a painter, draftsman, engineer,…

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Debunked

Phrenology

Phrenology was a popular nineteenth century practice that claimed a person's character and mental abilities could be read from the shape and bumps of their skull. It was widely embraced for decades, taught, charged for,…

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