The better title for this whole area of the website would be "stuff I find amusing". There is nothing "core" about it. Much of it is completely apocryphal. Knowing ninety percent of this material will not improve the way your practice intensive care, and not knowing this stuff will allow a fairly normal level of function. As an example, see the ion-selective electrode chapters in the blood gas interpretation section. Does anybody actually need to know anything about the valinomycin-impregnated membrane?