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Amusing, considering it's in an otherwise excellent article about being a "jerk" around know-nothing amateurs, is this line:
She swam back and forth in the pool, performing the stroke called freestyle.
Nuh-uh. "Freestyle" is the name of the race. The stroke most people perform in that race is called the front crawl (aka the Australian crawl).
Maybe someday some swimmer will invent a faster stroke -- and then suffer the indignity of having people call it "freestyle" -- turning them into a "jerk" around people watching swimming races...