In the 19th century, they called it “colored hearing”—letters and words, when spoken, took on mental weight and shimmered with color in the mind’s eye. For Miss C., who was interviewed in 1892, “n” ...

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How many times a day do you sing the alphabet to your little one? Probably more times than you can count, right? With ABCs come 123s, and because children learn through repetition, you’re probably ...