Open biohacking and open source medicine-terms that inspire both hope and concern. When biotechnological processes no longer take place only in universities and corporations, but in garages and community laboratories, a new form of science emerges: open, participatory, but also risky. This book introduces the history, ideology, and practice of the biohacking scene, presents key players and projects, and explains the technologies that make DIY biology possible in the first place - from CRISPR kits and mRNA platforms to synthetic biology. It asks the big questions: democratization or new inequality? Innovation or risk? The analysis highlights opportunities, risks, legal gray areas, and ethical dimensions-and shows that the future of open biohacking depends above all on whether openness can be combined with responsibility. An exciting book about the limits and possibilities of science in the 21st century. Bremen University Press has published over 5,000 specialist books in various languages since 2005. September 2025