(AJC) — In a 12th-floor conference room of a Buckhead law firm the other day, a group of high school students took turns explaining the recent Supreme Court decision to block a class-action sex discrimination suit against giant retailer Walmart. Girls dressed in modest skirts and blouses, the boys in shirts and ties, they easily looked the part. And their presentations were as reasoned and succinct as those of seasoned attorneys making opening arguments. Vesselina Kotzeva was poised and easily made eye contact with her audience. She managed even to make her case absent that singsong phrasing that is so common among teenage girls and that her young “colleagues” had become used to over the past week.