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Why Is It Called a "Litmus Test"?

A litmus test is an idiom for a challenge. But why? In a 2024 New York Times piece exploring the controversy over married couples in Japan using separate surnames, the Times headline read: "A Litmus ...
In a 2024 New York Times piece exploring the controversy over married couples in Japan using separate surnames, the Times headline read: “A Litmus Test in Japan: Should Spouses Have Different Surnames ...
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