Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
전기쟁반을 사용하여 정전기를 생성할 수 있습니다.jeongi-jaengbaneul sayonghayeo jeongjeongi-reul saengseonghal su itsseumnida.You can generate static electricity using an electrophorus.