They don't really. Most people are smart enough to know that hair color has nothing to do with brainpower, but the stigma can be attributed to the abundance of blonde jokes.
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There is no scientific evidence to support the idea that brunettes are inherently smarter than people with other hair colors. Perceptions about intelligence based on hair color are rooted in stereotypes and societal biases, rather than any factual basis. Intelligence is unique to each individual and is not determined by physical characteristics like hair color.
Some people may think they are smart due to a combination of confidence, knowledge, and past successes. Others may have a natural inclination to compare themselves to others and perceive themselves as more intelligent. Additionally, social factors such as validation from others or cultural beliefs about intelligence can also play a role in shaping individuals' perceptions of their own intelligence.
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Some common stereotypes associated with brunettes include being seen as intelligent, mysterious, passionate, and down-to-earth. They may also be stereotyped as more serious or dramatic compared to blondes.
Some people think that only stupid people have to ask about things, because smart people should already know. To them asking has a negative connotation. Whereas, of course, the truth is that smart people ask about things whereas stupid people assume they already know. Socrates was the first person to say so, about 2300 years ago. Socrates was an incredibly smart person who asked questions constantly about things the people around him thought they knew (but didn't).