Books about or involving alternative medicine: any practice that aims to achieve the healing effects of medicine, but which lacks biological plausibility and is untested, untestable, or proven ineffective.
Books about or involving climate change denial: denial, dismissal, or unwarranted doubt that contradicts the scientific consensus on climate change, including the extent to which it is caused by humans, its effects on nature and human society, or the potential of adaptation to global warming by human actions.
Books about or involving conspiracy theories: an explanation for an event or situation that invokes a conspiracy by sinister and powerful groups, often political in motivation, when other explanations are more probable.
Books about or involving creation science: a pseudoscience which claims to offer scientific arguments for certain literalist and inerrantist interpretations of the Bible. It is often presented without overt faith-based language, but instead relies on reinterpreting scientific results to argue that various myths in the Book of Genesis and other select biblical passages are scientifically valid. Creationists also claim they can disprove or reexplain a variety of scientific facts, theories and paradigms of geology, cosmology, biological evolution, archaeology, history, and linguistics using creation science.
Books about or involving cryonics: the low temperature freezing and storage of a human corpse or severed head, with the speculative hope that resurrection may be possible in the future. Cryonics is regarded with skepticism within the mainstream scientific community.
Books about or involving cryptozoology: a pseudoscience and subculture that aims to prove the existence of entities from the folklore record, such as Bigfoot, the Loch Ness Monster, the chupacabra, or the Mokele-mbembe - these entities are referred to as cryptids. Because it does not follow the scientific method, cryptozoology is considered a pseudoscience by mainstream science: it is neither a branch of zoology nor folklore studies.
Books about or involving eugenics: a set of beliefs and practices that aim to improve the genetic quality of a human population, historically by excluding people and groups judged to be inferior or promoting those judged to be superior. In recent years, the term has seen a revival in bioethical discussions on the usage of new technologies such as CRISPR and genetic screening, with a heated debate on whether these technologies should be called eugenics or not.
Books about or involving numerology: the belief in the divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value of the letters in words, names, and ideas.
Books about or involving phrenology: a pseudoscience which involves the measurement of bumps on the skull to predict mental traits. It is based on the concept that the brain is the organ of the mind, and that certain brain areas have localised, specific functions or modules. Although both of those ideas have a basis in reality, phrenology extrapolated beyond empirical knowledge in a way that departed from science.
Books about or involving vaccine hesitancy: a delay in acceptance, or refusal of vaccines despite the availability of vaccine services. It is influenced by factors such as complacency, convenience and confidence. Among the hesitant are groups known as "anti-vaxxers", however not all vaccine hesitant are against vaccination. The term encompasses outright refusal to vaccinate, delaying vaccines, accepting vaccines but remaining uncertain about their use, or using certain vaccines but not others. Arguments against vaccination are contradicted by overwhelming scientific consensus about the safety and efficacy of vaccines.