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Case file

Amos Tversky

In 2005 Wikipedia's first sentence called it “pioneer of cognitive science”. Today it says “israeli cognitive and mathematical psychologist and a key figure in the discovery of systematic human cognitive”.
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 2026-08-02. In 2005 Wikipedia's first sentence called it “pioneer of cognitive science”. Today it says “israeli cognitive and mathematical psychologist and a key figure in the discovery of systematic human cognitive”.
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

Amos Tversky ( March 16 , 1937 - June 2 , 1996 ) was a pioneer of cognitive science , a longtime collaborator of Daniel Kahneman , and a key figure in the discovery of systematic human cognitive bias and handling of risk .1 With Kahneman, he originated prospect theory to explain irrational human economic choices. He received his doctorate from the University of Michigan in 1965 , and later taught at the Hebrew University in Jerusalem , before moving to Stanford University . In 1984 he was a recipient of the MacArthur Fellowship . Amos Tversky was married to Barbara Tversky , presently a professor in the psychology department at Stanford.2 He also collaborated with Thomas Gilovich , Paul Slovic and Richard Thaler in several key papers.3

This is Wikipedia's own text, saved in our repository. Their copy of it is revision 16052333.
Today
In 2005 Wikipedia's first sentence called it “pioneer of cognitive science”. Today it says “israeli cognitive and mathematical psychologist and a key figure in the discovery of systematic human cognitive”. Read the current article and compare.
2005201020152020Oct '232025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.

What Wikipedia says this is

Every article opens by defining its subject. This one was redefined between 2005 and 2025.

Then

pioneer of cognitive science

Now

israeli cognitive and mathematical psychologist and a key figure in the discovery of systematic human cognitive

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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