When people like me write about the middle class, it has nothing to do with envy or class warfare—two shopworn epithets that should be retired from the political lexicon. The condition of the middle ...

Litmus paper, long known as a low-tech method of testing substances for acidity, might have a new use as a cheap, quick way to test for E. coli, according to researchers at McMaster University in ...

You remember chemistry class, don’t you? Of course you do. In chemistry class, a “litmus test” was the way you checked the ...