In the 16th century, before the term mandarin became widespread in the European languages, the word Loutea (with various spelling variations) was often used in Europeans' travel reports to refer to Chinese scholar-officials.
Why do some people get smelly gas after eating eggs? I really love eggs, but I get really bad, sulfurous and rotten egg-smelling gas after eating eggs. This doesn't happen when I eat foods which contain eggs in moderate amounts (cakes, etc), but it does happen when I eat hard-boiled eggs or fried eggs. I don't get any stomach cramps or any other symptoms of allergy, however.
In other words, anything that causes more farts that is not eggs is an extraneous variable. If our sample of students used Beano (anti gas medication) that would effect how much gas they have. If one of our students had diarrhea, it would effect their farting behaviors and it would have nothing to do with the eggs. Remember, the object is to prove that eggs cause the gas, and if anything else could have caused the gas, it messes up our study.