When you were young, the adults in your life likely taught you about "stranger danger," warning you that people you didn't know could harm you.
When it comes to children, I wholeheartedly agree: Avoiding strangers is a good way to stay safe. Frankly, I still sometimes avoid strangers in public places for fear that something might go wrong. Perhaps it's a reflex left over from childhood.
But when you're a professional, strangers are exactly the people you should be talking to.
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Source: Recruiter