In diplomacy, does a fist bump somehow convey less respect than a handshake? Or is it casual and colloquial, and therefore friendlier? How do you greet a leader whose state you vowed, during your ...

In this image released by the Saudi Royal Palace, Saudi Crown Prince Mohammed bin Salman, right, greets President Joe Biden with a fist bump after his arrival in Jeddah, Saudi Arabia, Friday, July ...