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Classic usage
Vocabulary level: Upper-intermediate · Flesch–Kincaid grade 6 · 2,053 sentences
Vocabulary level is estimated from word frequency, not an official CEFR classification.
Subjects: Science fiction
Words worth knowing: harmlessly · designer · uncontrolled · armada · lab · sourly · inefficient · acceleration
[Cover Illustration: JOHN W. CAMPBELL THE ULTIMATE WEAPON When star fights star, is chaos the best defense?]
RED SUN RISING The star Mira was unpredictably variable.
Sometimes it was blazing, brilliant and hot.
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Classic usage
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