New York City is testing this innovative technology on its subway system. Here's what it means for stockholders.There is something special about seeing events live, whether you like sports, concerts, or shows. I recently visited T-Mobile Arena in Las Vegas to watch the Vegas Golden Knights take on the Detroit Red Wings, and there was something different about getting into the arena. I'll explain below.A large part of any event is security. Sadly, mass shootings have skyrocketed over the past 20 years. New Y ...