Book excerpt: While evidence for the biological effects of high dilutions (above Avogadro’s number) has been extensively documented since the 1980s, it seems to remain invisible to part of the global scientific community. This book provides investigators and other interested readers with direct access to the latest research, conducted between 2009 and 2019, by members of the Groupe International de Recherche sur l’Infinitésimal, the first international scientific society devoted to scientific studies of high dilutions. As shown here, the state of the art in high dilution research allows answering with a sound, evidence-based “no” to the question “Is homeopathy really that implausible?” Therefore this book is an essential contribution to the ongoing debate on complementary and alternative medicine, much-needed by practitioners, patients, and governments in the formulation of healthcare policies.