VANCOUVER — Psychology Prof. Gillian Sandstrom was a lonely graduate student in Toronto when she began what she calls “a tiny, tiny micro-relationship.”

She and a woman who ran a hotdog stand on her way to university around 2007 would wave hello and smile at each other. Their interactions were so small that Sandstrom uses air quotes to even describe them as a “relationship.”

And yet “it really meant something much bigger than it seemed like it should, and it made me feel like I belonged there,” said Sandstrom.

“I felt very out of place and she, more than anyone else, is who made me feel OK, which was a bit puzzling.”

Sandstrom, who works as an associate professor of psychology at the University of Sussex in England, now attributes the woman at the hotdog stand with setting her on the c

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