A perfect example subject to personal verification is how body scent varies with hair color.
Reds are spicy, blondes are \"citrusy\", brunettes are warm-smelling. This is classically an aid in choosing a perfume - brunettes tend to the orientals, blondes maybe more florals, etc.
Try this test with some new friends:
Have your subjects freshly bathed and unscented. Blindfold yourself. Have them do some light exercise then guess their hair color. I bet an experienced tester could beat random guessing.
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