The article comments on the errors and misinterpretations of Douglas Allchin, a researcher, on his criticisms of authors who portray the history and nature of science in ways contrary to his own. On a research conducted by fellow researcher William Harvey, he mentioned the that blood flow was generally hypothetico-deductive (H-D) and made specific prediction of capillaries, which Allchin has refuted, claiming that no such predictions were made. Allchin has also criticized H-D reasoning as being algorithmic.