I think everyone who works in the research-to-practice area has a persistent myth that annoys them the most. Mine is unquestionably the goldfish attention span one.
Here’s my pass at a video to address that (note: contains a shameless marketing plug):
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Patti Shank’s detailed investigation: https://elearningindustry.com/8-second-attention-span-organizational-learning
Ken McCall’s Linkedin writeup (he actually ordered the book to investigate the claim, which is a gold star in my estimation):
The Ceros folks did the deepest dive into the origins, even checking the internet archive (hashtag nerdrespect!)
Props to Entrepreneur and the BBC for not propagating the myth: