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.
Shortcuts and key combinations. By default, Haiku's shortcut key, to invoke commands from menus for example, is not the usual CTRL key, but ALT instead. This has historical reasons, because the BeOS was inspired somewhat by MacOS. After you get used to it, it actually has advantages as e.g. ALT C and ALT V integrate seamlessly into the bash shell of the Terminal, where CTRL C quits the running process. In any case, you can switch to the maybe more familiar CTRL key in the Keymap preferences.