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When you open an English Wikipedia article, it can feel like the
complete account of a topic.

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Switching languages may seem like asking for the same account in
different words.

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But the editions are not simple copies. They can contain
complementary facts.

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WikiGap asks how to make those differences visible while someone
is already reading the English article.

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The goal is to make other editions easier to discover as sources
of knowledge.

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The visual example here is schematic: different cards stand for
different facts, rather than real Wikipedia quotations.

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The interface places subtle markers inside the English article.

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Selecting a marker reveals a related fact card in a panel beside
the text.

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The card presents the additional fact in English, alongside its
source-language label.

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That keeps the new information close to the passage that
prompted the reader's curiosity.

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The source link opens the original sentence in context, allowing
the reader to inspect where the fact came from.

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Discovery and checking therefore become connected parts of the
same reading interaction.

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Behind the interface, WikiGap uses and extends a prior pipeline
called InfoGap.

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The pipeline breaks paragraphs into atomic facts before
comparing language editions.

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Multilingual representations retrieve likely matches, so the
verifier can examine a smaller candidate set.

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The verifier then asks whether a fact is inferable from the
matched material.

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A fact without an aligned English counterpart becomes a
candidate knowledge gap for that English article.

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WikiGap turns selected gaps from French, Russian and Chinese
editions into the reader-facing cards.

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The interaction can start with a marker encountered during
ordinary reading.

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It can also begin with a particular question. Readers can filter
by source language and search the fact cards.

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Both paths keep the source edition visible, instead of blending
all the information into an anonymous summary.

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The paper evaluates this reading design through a study with
twenty-one participants.

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Each participant uses both conditions for different food topics,
with treatment assignment randomized.

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They answer open-book fact-finding quizzes using the supplied
articles.

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In the reported quiz, average accuracy is seventy-three percent
with default navigation.

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With WikiGap, it is ninety-one percent.

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The same study reports average completion times of twenty point
eight four and twelve point three nine minutes.

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These measurements concern quizzes built around the selected
cross-language facts,

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rather than unrestricted web browsing.

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The detailed usability results also favor WikiGap,

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with mean scores of eighty-two point five versus forty-eight
point two.

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Together, the results connect this interface design to easier
fact-finding in the study's specific setting.

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The idea to remember is that language editions can contribute
different knowledge about the same topic.

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WikiGap makes those differences discoverable without requiring a
reader to leave the English article first.

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Fact cards supply an English presentation, a language label, and
a path back to the original context.

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A useful interface can therefore change which knowledge becomes
visible in everyday reading.