Why Do We Have Allergies?

Pollen's not dangerous; it's a fundamental part of life on land.

For hundreds of millions of years, every land animal ever has lived with pollen. You'd think we’d have had plenty of time to evolve a way to deal with it.

So how have our bodies not figured this out yet?

Full story:
https://www.opb.org/news/article/why-allergies-summer-pollen-video/
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Видео Why Do We Have Allergies? канала Oregon Public Broadcasting