Blow your nose. Before using the nasal spray, you need to clear your nasal passages. Otherwise, the medication might get caught in the front of the nostril, where it will be less effective. Blow your nose until you have completely cleared your nostrils. 1  Do not blow your nose after using the spray.
The basic difference is the pin of the transistor that is grounded. The common collector has the collector pin grounded, common emitter has the emitter pin grounded and common base, as you guessed it, has the base pin grounded. The following article explains the differencnes perfectly.
Yes, BJTs have the same voltage drop across their junctions as common diodes, that's 0.6V Ã  0.7V between base and emitter, and the same between base and collector. Since they act like diodes they don't conduct in both directions if you apply a voltage across the two pins.