"In February 1994, [Mary] Tai authored a paper in the journal Diabetes Care entitled "A Mathematical Model for the Determination of Total Area Under Glucose Tolerance and Other Metabolic Curves." …What Tai "discovered," even being so bold as to term it Tai's Model, is integral calculus. ...the trapezoidal rule for calculating the area below a curve, which seems to have been known to Newton. And yet Tai's article passed through the editors and has received well over one hundred citations in the scientific literature. A number of letters written in response to Tai in a later issue... pointed out that this technique is well-known and available in many introductory textbooks. ...in many situations knowledge can spread far slower than we might realize."