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How to teach science
With your class (es), introduce yourself in a way that makes you seem friendly and trustworthy.
Most students don't feel comfortable with teachers because, to be honest, most seem snappy. Therefore, have a calm, sweet complexion and attitude on the first few days of school.
Talk about the classroom, where to get supplies, and what the rules are. Do not add a sour feeling when you speak of the rules, speak of them as if they were classwork.