[carbide]

The peanut butter test is interesting. For sufferers of early onset Alzheimer's, the range at which you can detect a smell is different between your left and right nostrils. They used Peanut Butter in this test done by the University of Florida.

https://en.wikipedia.org/wiki/Peanut_butter_test

[blue1]

Before someone freaks out over peanut butter, note that according to Wikipedia an attempt to duplicate these results has failed.

[dsego]

Now you have me worried.

[tptacek]

At long last, the fabled credible Google symptom search result revealing that your stuffy nose is a smoking gun indicator of a fatal illness!