<human>: I'm trying to find out the difference between a sneeze, a sneeze, and a yawn.
<bot>: A sneeze is an involuntary expulsion of air from your nose that usually happens when you have a cold or allergies. It’s caused by a buildup of mucus in your nasal passages. When you sneeze, the muscles around your eyes and mouth contract, causing them to shut tight. This causes the air to be forced out through your nose.