Updated majorly 11/9/2024. One reference was no longer viable and information from two other references was found in place.

The research for this post on how the immune system works turned up so much information that this will be the first installment in a three-part series. In Part 2, we will see about allergies and autoimmune chaos, and then in Part 3, nutrients for the immune system. First, there is quite a bit more to the immune system than white cells fighting the bad micro-critters. Some of those components call for the white blood cells!

Two kinds of immunity exist, both of which involve more than white blood cells(1).
Innate immunity employs barriers to keep out a whole bunch of potential pathogens. Skin is actually a barrier that keeps out the majority of pathogens that would otherwise cross over(1). The same outermost layer of skin that protects from UV radiation damage also protects from undesirable bacteria(2). Perspiration and tears have enzymes helping to create antibacterial substances. Mucus traps. Stomach acid puts to death(1).
Adaptive/acquired immunity learns and puts pathogens on the "unwanted" list. "It is regulated by cells and organs in our body like the spleen, thymus, bone marrow, and lymph nodes." Speaking of skin again, "[t]here is continuous trafficking of immune cells between the skin, draining lymph nodes, and blood circulation."(3) Cells and organs create antibodies, which leads to immune cell multiplication and the conquering of the invader. The immune system then is told to "Remember the ___!" so should the same invader marches in for a repeat encounter, it is on record and there is a more efficient, speedy response(1).

Personal Product Favorites [LINKS below]:
Collagen bone broth with skin/immune support
Natural hydrating drink with immune support
LIMITED EDITION/SEASONAL hot chocolate with skin/immune support
Immune boost powder

References:
1. "Nutrition and Immunity." Harvard T. H. Chan School of Public Health: Powerful ideas for a healthier world. The President and Fellows of Harvard College. Web. November 8, 2024. https://www.hsph.harvard.edu/nutritionsource/nutrition-and-immunity/.
2. "Why Skincare Matters Both Inside and Out." Isagenix Health. Isagenix Worldwide, Inc. Web. November 9, 2024. https://isagenixhealth.net/why-skincare-matters-both-inside-and-out/.
3. Velykoredko, Yuliya and Bohdanowicz, Michal. "Skin immune system." DermNet: All About the Skin. DermNet Development Group. September 2017. Web. November 9, 2024. https://dermnetnz.org/topics/skin-immune-system.

Macadamias came from rainforests(1,2) in Queensland and New South Wales(1), which ranged along the northeast coast of Australia and were east of(2) [the major mountain range of the continent called] the Great Dividing Range. The toughness of the shell caused them to remain more of a treasured delicacy to the native Aboriginals. After women collected them, the shells had to be cracked with indented stones fitted to the nuts then struck by bigger stones in order to deliver evenly-displaced force without harming the kernel so much. Tribes traded the nuts and they "used as special ceremonial gifts at inter-tribal corroborees."(2) Early British settlers learned about them from the Aboriginals; Allan Cunningham is credited as the first European discoverer, from the year 1828(1).
​Walter Hill and Ferdinand Von Mueller, botanists, became fascinated with the trees in the mid-1800s(2), who created a new genus to put them in 1858 and named them after "John Macadam, MD., secretary of the Philosophical Institute of Victoria."(1) The first macadamia plantation only came out the 1880s(1,2), in the northern portion of New South Wales, Australia. Hawaii started planting the trees as windbreaks in 1882(1). It was only with the arrival of "successful grafting techniques and the introduction of mechanical processing that commercial production of the tough nut became feasible. Macadamia enthusiast Norm Gerber pioneered the grafting techniques"(2). 
Encouragement to grow macadamias in Hawaii came about in 1910 by the Hawaiian Agricultural Experiment Station. The University of Hawaii worked on commercial development in the 1930s, yet large exportation of the nuts from Hawaii wouldn't come till after World War 2(1).

References:
1. "History of macadamia nut." Food History. Food History. 25 Sept. 2017. Web. 12 Jun. 2021.  https://www.world-foodhistory.com/2017/09/history-of-macadamia-nut.html.
2. "History of the Macadamia." Australian Macadamias. Australian Macadamia Society. Web. 12 Jun. 2021. https://www.australian-macadamias.org/consumer/our-story/history-of-the-macadamia.