
Keep your codes fixed for years (your face, one colour, one mark, one sign-off, named series) and vary the format: reel, carousel, short, live, story. Familiarity builds liking up to a point; one format repeated gets boring.
S Evidence: strong. Large trials or many studies, pointing the same way.
Montoya et al. 2017 (meta-analysis, 268 curve estimates).
Not medical, legal or financial advice.
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