This is cool because it has several components. That the iron content of spinach is a myth is itself a myth is just the starting point of a fascinating investigation of a number of related myths about how the confusion first came about and then came to light (some of which are themselves actually true and so only mythically myths). Thanks to Mike Sutton who may well be the world’s champion in identification of mythical myths.
A story started thirty years ago by nutritionist Professor Arnold Bender, and famously supported by the immunohaematologist Professor Terence Hamblin, that a decimal point error made in 19th Century research of the iron content of spinach led to its erroneous promotion, is completely untrue.