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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 ...
CNN

RNC officials deny ‘litmus test’ related to 2020 election for those seeking employment

Top officials at the Republican National Committee are denying reports that there is a “litmus test” for those seeking employment related to whether they believe the 2020 election was stolen. The ...