Wow, who would have thought?
One thing about dung. Some Indians, Mongolians, Nepalis, Tibetans, etc. burn cow dung inside their homes for cooking and heating. I used to think those homes must have smelled pretty bad. But you know what? Visiting some of the homes in Mongolia and Tibet last year, I found the smell actually 'pleasant'! They explained to me that's because their yaks ate only grass.