Sources:
https://phys.org/news/2019-05-exploring-history-apple-wild.html
https://www.nationalgeographic.com/culture/article/history-of-apples
https://www2.palomar.edu/users/warmstrong/pljan96.htm
https://www.maineforestry.net/grafting-apple-trees
https://www.nature.com/articles/s41438-018-0084-4
https://web.extension.illinois.edu/apples/facts.cfm
https://pickyourown.org/USapplecrop.htm
https://bestapples.com/resources-teachers-corner/johnny-appleseed/
https://priceonomics.com/how-apple-pie-became-american/
http://www.ecoenchantments.co.uk/myogham_applepage.html
https://historiska.se/norse-mythology/idun-en/
https://www.alimentarium.org/en/knowledge/apple-discord-and-beauty
http://www.perseus.tufts.edu/Herakles/apples.html
https://www.greekmythology.com/Other_Gods/Minor_Gods/Hesperides/hesperides.html
https://www.faena.com/aleph/how-did-the-apple-become-the-symbol-of-sin