1- https://freakonomics.com/podcast/big-returns-from-thinking-small/
2- https://www.vox.com/science-and-health/2018/9/19/17879102/brian-wansink-cornell-food-brand-lab-retractions-jama
3- https://en.wikipedia.org/wiki/Nudge_theory
4- https://eclass.yorku.ca/pluginfile.php/2670623/mod_page/content/3/Do_people_really_want_to_be_nudged_towards_healthy.pdf