Nerd with a chemistry set is describing a "nerd" using a chemistry set. "Nerd" usually refers to the stereotypical person with glasses, terrible fashion, lack of a social life, has an extreme obsession with getting good grades, and loves things like math and science. People don't really use "nerd" anymore.
The Language Level symbol shows a user's proficiency in the languages they're interested in. Setting your Language Level helps other users provide you with answers that aren't too complex or too simple.
Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
This answer was given within 60 minutes of the question being posted.
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