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Wow! I Never Knew That! (Episode 6)

11 minutes

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Jeff "JJ" Johnson explains how the microwave oven was invented, why onions make people's eyes water, and why the telephone has a pound key. This segment also explains the reasoning behind the numbering of highways based on direction of travel. Other segments include discussions about brain freeze, the science of bioluminescence in fireflies, and the invention of the popsicle. Part of the "Wow! I Never Knew That!" series.

Media Details

Runtime: 11 minutes

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Wow! I Never Knew That!
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Episode 2
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