This document discusses ethics in science. It begins by defining science as the pursuit of knowledge through empirical evidence and logical reasoning. The document then discusses some ethical issues that can arise in scientific research, such as the use of human and animal subjects. It notes there are guidelines to ensure ethical treatment of research participants. The document also discusses the ethics of stem cell research, which some view as destroying potential human life, while others see its benefits for medical advances. It concludes by noting science can benefit society but also requires ethical oversight to avoid unintended harms.