Every card, lesson screen, glossary entry and reference record across all three Labs. It does not need to be precise — type roughly what you are after and the closest matches come first.
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What this searches. Flashcard questions and answers, every lesson screen including its tables, boxes and author's notes, and the glossary.
What it does not. Mastery-gate questions are deliberately excluded — seeing one in a search result would spoil the one part of the app whose value depends on not having met it before.
Loose is fine. Misspellings, partial words and shorthand all work, and the Labs' own abbreviations are expanded automatically — searching TZD finds thiazolidinedione, VAT finds visceral adipose tissue.