If you think that your dog has an incredible sense of smell, you may be surprised that you do too. According to the Social Research Center, people can detect certain substances in dilutions of less than one percent of the air. If you have already entered someone's house and can immediately see what he has eaten hours ago, you can thank your sense of smell. Even if you do not have the nose of a bloodhound, you will not be left behind.
Sinusitis is one of the common complications that can occur after a cold or an allergic attack. It is difficult to tell when a common cold has turned into sinusitis, but some of the major indications are pain and pressure on the face. Although most symptoms disappear within two weeks or less (with or without treatment, depending on the cause), you can also develop chronic sinusitis, which can last for months.