I keep a stack of articles in my study. They cover themes I’ve found of great interest. Many pertain to topics I consider addressing in one of my monthly columns. As I was recently reviewing several of these articles, one especially caught my attention. It was based on an interview on NPR conducted by Rhitu Chatterjee with Dr. Gillian Sandstrom, a psychologist at the University of Sussex in Great Britain. It had the intriguing title, “Why a Stranger’s Hello Can Do More than Just Brighten Your Day.” Chatterjee wrote that prior to Sandstrom enrolling in a Master’s program in psychology at Ryerson University in Toronto, followed by a doctoral program in psychology at the University of British Columbia, she was employed as a computer programmer. Sandstrom recalled that at Ryerson she was 10 years older than most of the other students in her program and didn’t “instantly feel like a part of that community.” As she walked each day from one university building to another, she passed a woman selling hot dogs. This brief daily interaction, as she noted on her bio on the University of Sussex website, inspired her to study the impact of “interactions with weak ties.” Sandstrom…