On smell

From The sweet smell of morality
How scent can shape our thinking (via 3quarksdaily):
"The idea that a smell can affect something as complex as ethical behavior seems surprising, not least because smell has long been seen as a “lower” sense, playing on our emotions and instincts while our reason and judgment operate on another plane. But research increasingly shows that smell doesn’t just affect how we feel: It affects how we think, in ways that are just beginning to be understood."

I remember that some of the books published by MIR in the 50's had some strong unpleasant smell and so I never read the collected works of Marx and Engels. Perhaps one can experiment with children's books to make study more appetizing.