 (a) does not satisfy (1), and is therefore not pseudoscientific on either account. (b) satisfies (1) but neither (2′) nor (2″) and is therefore not pseudoscientific on either account. (c) satisfies all three criteria, (1), (2′), and (2″), and is therefore pseudoscientific on both accounts. Finally, (d) satisfies (1) and (2″) and is therefore pseudoscientific according to (1)+(2″) but not according to (1)+(2′). As the last two examples illustrate, pseudoscience and anti-science are sometimes difficult to distinguish. Promoters of some pseudosciences (notably homeopathy) tend to be ambiguous between opposition to science and claims that they themselves represent the best science.