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90 seconds to learn about eyestrain and short-sighted

Eye-straining works, such as PC work, cause eye diseases. Learn how to treat your eyes in 90 seconds.
Japanese Learning Course for JLPT N5 Level
Noh english  1 90 seconds to learn about Noh - traditional art of Japan!
Eight beat square 90 seconds to learn how to play the 8th note rock beat
Drumfill sq 90 seconds to learn how to play a basic drum fill
Syuchusen en 90 seconds to learn how to draw a concentrated linework