Today, after I took off my sweater, my hair stood up on end. This was because of static electricity in the dry air, and the rubbing of the material of the sweater. With the rubbing, electrons transferred from the sweater (which was probably made from a material that is an insulator) to my hair. The hair is filled with electrons, which are repelling each other. As they repel each other, hair strands will try to move away from each other, and the way they do it is by standing up and away from each other.
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