you know this research was published in 2006, and is based on earlier work (from the citations you can see papers from the early 1970s onwards) which suggests the ignorance might be more localised ;)
I believe GP meant 'figuratively' (a common modern use of 'literally,' disconcertingly) and could also be mixing unrelated idioms such as swim like a fish and swimming upstream, though it is commonly known salmon swim upstream, I'm not sure this fluid dynamics epiphany changes anything there. If it could technically be incorrect to say salmon swim upstream, how should it be phrased correctly? Salmon get sucked upstream?
Maursault|3 years ago