We publish our audit record because accuracy claims should be checkable. Every entry on this site runs through an automated fact-audit pipeline (accuracy audit → source-grounded repair → visual QA); this page is generated from that pipeline's own report, not written by hand.
Last full accuracy audit: 2026-09-05 · 10 entries checked · 5 flagged · 8 issues confirmed · 5 corrected · 3 still open
Visual perception — The entry states 'Most vertebrates have two modes for this: photopic vision for daytime and scotopic vision for nighttime, and most possess both.' This is factually incorrect because many vertebrates (e.g., many deep-sea fish) lack one or both modes.
Visual perception — The 'DID YOU KNOW' section implies Euclid and Ptolemy proposed the same correct emission theory as Alhazen, but they actually proposed extramission theory (rays from the eye), not intromission theory (light entering the eye).
Pupil — The claim that all foxes have vertical slit pupils is inaccurate; some species, like the arctic fox, have more rounded pupils.
Pupil — The claim that the emperor penguin's pupil becomes square-shaped when contracting is incorrect; emperor penguins have circular pupils that constrict to a round opening.
Purkinje effect — The year of discovery is stated as 1819, but the widely accepted historical record is that Jan Evangelista Purkyně first described the effect in 1825, not 1819.
Tears — The entry states that tears are produced by the lacrimal glands 'present in all land mammals,' but this is not universally true; some land mammals have reduced or absent lacrimal glands.
Tears — The 'DID YOU KNOW' section states that emotional tears contain higher concentrations of stress hormones as a definitive fact, but this is a contested hypothesis, not a confirmed fact.
Tetrachromacy — The entry states 'showing three-dimensional color discrimination for wavelengths 546–670 nm' but the correct description is four-dimensional color discrimination (tetrachromatic) in that range.
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