Mike Nudelman/Business InsiderFrom the moment two people meet, they're sizing each other up, looking for signs of qualities like honesty, intelligence, and altruism. Whether it's a date or a job interview, the small stuff matters — from the firmness of your handshake to how often you check your phone. We checked out the Quora thread "What are the really small things that tell a lot about a person's psychology and personality?" and the latest scientific research, and highlighted some of the most common behaviors people use to judge you.Mike Nudelman/Business Insider 1.