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C1 · Idiomatic

Feature-style pieces with nuance, abstraction, and precise lower-frequency vocabulary. Notes cover only the words worth carrying into your next read.

Every piece comes with word notes, narrated audio, and an annotator you can ask about any sentence. No sign-in needed.

01
HEALTHC1

Jet Lag: Resetting the Body Clock

Jet lag comes from a mismatch between the body's internal clock and the new local time, and only a few well-timed habits actually fix it.

by Kosk·6 min read
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02
HISTORYC1

Measuring the World: A Short History of the Metric System

The metric system was born from a political revolution and perfected by a scientific one, creating a shared language of measurement that now underpins global science, trade, and everyday life.

by Mira Tanaka·6 min read
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03
CULTUREC1

Hamlet Thinks Aloud

Thirty-three lines in which a prince, commanded to act, instead weighs whether to stay alive.

by Theodore Ash·7 min read
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