When learning the nuances of body language, it’s important to note that depending on the country or culture it’s displayed in, the same gesture can be acceptable or offensive. You might be thinking, “I’m not a world traveler, so this isn’t really relevant to me.” You’re wrong. Since the United States is a melting pot of cultures, you’re very likely to run across someone of a different background at some point in your life. Knowing why he does the things he does—and why he reacts to certain gestures—could save you from embarrassing yourself.