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Fall, 1946. Stories include "Mel Mason and the Secret Message" (art by Thompson), "How Pulse-Time Modulation Works," "What in the FutureWorld" (one day there will be house numbers that glow in the dark! Newspaper vending machines! Machines at bowling alleys to re-set the pins automatically! Small radios that use circuits instead of wiring!), "Jack Boyd and the Sunken Treasure," "How Sonar Works," "Spark Rogers and the Trapped Train Robbers," and "How Inductive Radio Works." H.C. Kiefer cover.
Cover price $0.10.