2008 was the earliest use of the word "mansplain"

And, crucially, stop if the person you’re talking to indicates that they’ve gotten what they need from the conversation, and accept it if they say they know more about the subject at hand than you do.

Mansplaining is jumping into AstroKatie’s mentions to “well, actually” her tweets on astrophysics when it’s almost a statistical certainty that she knows way more about the subject than you do. It’s not answering a colleague’s question.

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