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How A Wave Is Unlike An Armadillo: One Reporter's Summer Puzzle

02:54
The same word is used to describe light, a lively sea, or a ripple in the fabric of space-time. What's in a wave? (Photo illustration by Meredith Rizzo/NPR)
The same word is used to describe light, a lively sea, or a ripple in the fabric of space-time. What's in a wave? (Photo illustration by Meredith Rizzo/NPR)

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