This document discusses ethical issues in public health research, including definitions of scientific misconduct, types of misconduct, and infamous cases. It defines scientific misconduct as fabrication, falsification, plagiarism, or intentional deception in research. Types of misconduct include fabrication, falsification, plagiarism, failure to disclose conflicts of interest, and redundant publication. Notable cases include Diederik Stapel fabricating data in dozens of papers, Hwang Woo-suk falsifying human cloning research, and Andrew Wakefield fraudulently linking vaccines to autism. The document examines why misconduct occurs and how it should be managed.