Oddly Wired
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psychology

You judge a person's character by their appearance.

The 'halo effect' was identified by Thorndike in 1920, but the specific 'what is beautiful is good' stereotype regarding intelligence and kindness is most famously attributed to a 1972 study.

Dion, Berscheid, and Walster, 1972

Your first impression is a bias, not an insight.

Where this comes from

Study
Thorndike, 1920
What the check found
Thorndike identified the 'halo effect' as a general bias, but the specific claim about attractiveness triggering intelligence and kindness perceptions is a later development in social psychology.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.