Continue to examine ALL "scientific" observations, conclusions and theories IN RELATION TO EACH OTHER, and you'll see how little we really know for sure. In contrast to the changeable, often-contradictory, sometimes-near-whimsical theories of humans, you'll find a remarkably stable, dependable kind of "wisdom" in the natural world. (Some credit "Mother Nature" --- whatever became of "Father Nature"?) The precious few doctors (Medical OR Non-Medical) I've ever known to manifest truly profound respect for that "wisdom", not-likely-by-coincidence grew up on the farm and understood how life works in the real world, not just in the laboratory (and were often labeled "quacks" by "technological medicine").

So if you desire truly natural health, you need to read your anatomy-physiology textbook from the perspective of life as a CO-OPERATIVE effort, not as a COMPETITIVE one; even if it WAS written from the second perspective, as most are. ( A quick scan of the parts on the lymphatic system and the surely-misnamed immune system will tell.)

But keep reading, observing, thinking and reasoning --- "outside the box". Take nothing for granted; make no assumptions; question the "unquestionable". Always remember that truth, like life, is interdependent. All the pieces or elements must fit together and work together, or nothing fits and works. Even when we don't "have all the pieces", we can be sure that genuine truths will never contradict other genuine truths ---- nor that rare UNcommon quality we so glibly refer to as "common sense".