Mr. Wizard's World

Speed of Sound, Refraction, Trick, Light Bulb Filament, Glass Duet, Spell Check, Stars and more (2x5)

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Speed of Sound, Selective Refraction Trick, How Many Stars, Glass Duet, Spelling Checker, After a Forest Fire, Window Oscillation, Asparagus, Finding a Tree's Height. Mr. Wizard measures the difference between hearing the sound of a starter pistol over the walkie-talkie and hearing it through the air.