This coursebook offers an expansive exploration of bioethics, an interdisciplinary field examining ethical, social, and legal dilemmas in medicine, life sciences, and beyond. It challenges conventional boundaries, embracing Van Rensselaer Potter’s vision of bioethics as a global, holistic ethics of life—integrating human health, environmental considerations, and transdisciplinary insights. Through engaging discussions, thought experiments, and case studies, the book empowers students to critically reflect on ethical questions without dictating rigid answers. Topics range from the historical roots of ethical thought to cutting-edge debates in molecular biology, such as epigenetics and exposomics, demonstrating how interconnected human, animal, and environmental health truly are. Central themes include the limits of scientific knowledge, the biases shaping research, and the evolving interplay between moral philosophy and empirical science. Students will encounter key philosophical frameworks—ontology, epistemology, and ethics—woven into practical bioethical applications. Feminist philosophy, experimental bioethics, and embedded ethics enrich this perspective, urging readers to question assumptions, embrace diverse viewpoints, and connect ethical principles with real-world science. Targeted at students in philosophy, biology, biomedical sciences, and bioengineering, this book is a toolkit for future thinkers, fostering a nuanced understanding of how ethical science advances humanity in a complex, ever-changing world.