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Jabir ibn Hayyan

Wikipedia's first sentence called it “arab chemist and alchemist”. Today it says “tentatively dated to c”. The one-line description Wikipedia serves to search engines and AI systems read “Early Islamic alchemist”. It now reads “Islamic alchemist and polymath”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-03.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since. Pale dots: rewritten; the numbered note shows what it says now. 1 tap a number or a side note to jump between them
The opening as it read in 2005

15th century European portrait of "Geber", Codici Ashburnhamiani 1166, Biblioteca Medicea Laurenziana, Florence Jabir Ibn Hayyan ( ca. 721 , Tus , Iran – 815 , Kufa , Iraq ), full name: Abu Musa Jabir Ibn Hayyan Al-Azdi (أبو موسى جابر بن حيان الأزدي), was an Arab chemist and alchemist. Referred to in Western contexts by the Latinized form of his given name (Jabir), Geber , also known as the Father of Chemistry , because he was the first to scientifically systemize chemistry . Jabir was born in the year 721 CE as the son of a druggist of the famous Arab - Yemeni tribe of Azd . He later became the pupil of the celebrated Islamic teacher Imam Jaffar. He spent most of his life in Kufa, Iraq. In spite of Jabir's leanings toward mysticism and superstition, he more clearly recognized and proclaimed the importance of experimentation . "The first essential in chemistry," he declared, "is that you should perform practical work and conduct experiments, for he who performs not practical work nor makes experiments will never attain the least degree of mastery." He made noteworthy advances in both the theory and practice of chemistry. His books strongly influenced European alchemists and justified their search for the philosopher's stone . He is credited with the invention of many types of now-basic chemical laboratory equipment, and with the discovery and description of many now-commonplace chemical substances and processes — such as the hydrochloric and nitric acids , distillation , and crystallization — that have become the foundation of modern chemistry and chemical engineering . He was a prominent student of Jafar Sadiq . Jabir Ibn Hayyan and Geber were also pen names of an anonymous 14th century European alchemist, author of the treatise Summa Perfectione and several other books: see Pseudo-Geber .1

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Today
Wikipedia's first sentence called it “arab chemist and alchemist”. Today it says “tentatively dated to c”. The one-line description Wikipedia serves to search engines and AI systems read “Early Islamic alchemist”. It now reads “Islamic alchemist and polymath”. Read the current article and compare.
2005201020152020Oct '232025
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What Wikipedia says this is

Every article opens by defining its subject. This one was redefined since 2005, and today's defining sentence is their current revision.

Then

arab chemist and alchemist

Now

tentatively dated to c

Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.

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