The innate intelligence of the body makes sure that its organism is very well protected. Everything we encounter bears a rich load of foreign material. The air we breathe carries dirt, exhaust fumes, and bits of debris, including pollen grains from hundreds of different plants.
Dust that settles on the furniture and floors of our homes, often holds human or pet dander (tiny scales that flake from hair, skin or feathers) as well as microscopic cousins of the spider called mites. Even the food we eat harbors bacteria, mold and fungal spores.
Fortunately, the immune system does not have to confront the bulk of these substances all at once.
Amazing isn’t it?