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Why are there “common” allergies? For example, a common allergy is peanut allergy, but a rare allergy of sorts is to the sun. Why are some common and some are not?

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Why are there “common” allergies? For example, a common allergy is peanut allergy, but a rare allergy of sorts is to the sun. Why are some common and some are not?	1
When something is a trend why do people tend to like it more than if they saw it before?	1