Treatment of a child with pseudomembranous colitis depends on the severity of disease. Mild cases require cessation of antibiotics and supportive therapy with fluids and electrolytes. Evaluate patients with severe or persistent antibiotic-associated colitis for C difficile toxin in the stool.
OptiFine allows zooming in by pressing the Control key. The closest thing in vanilla Minecraft is to use a bow and arrow, and aim the bow toward where you want to look, and to fire it when you are done looking.
The Redstone Comparator is perhaps the most complicated device in all of Minecraft. It has two operation modes, which can be toggled by right-clicking; the front torch indicates what mode it is in. Aside from these two actions, it has another two.