“Organic” might be the most abused word in the English language. Chemists, farmers, and marketers all use it—and none of them mean the same thing. The result is a label that can make Oreos, cigarettes ...

It feels ineffable and undeniable—you just know it when you see and feel it. When two people have chemistry, onscreen or off, it’s a captivating thing to behold. But is it a magical moment of ...