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 ...

According to a report on S amKnows.com, O2 is prepped to launch its own version of the App Store for all handsets connected to its network. The project, known as Litmus, aims to provide a similar ...