So many people are struggling with pollen allergies right now. But why? There were no allergies 100 years ago. The latest theories are telling us that we live in environments that are too clean. I doubt that. The immune system is generally way too sophisticated to be thrown off balance by a lack or an overabundance of germs. It has a million feedback loops and doesn’t make mistakes. Allergies should be impossible unless the immune system has been tricked into attacking the wrong things. How would that be possible? Easy: we use vaccines to try to teach the immune system "our version" of what to attack. Overlap with the wrong thing? Immune system becoming ramped up way too much? No problem, that's just called an allergy.