快猫短视频

With the Australian spring comes seasonal allergic rhinitis, or hay fever. But why do humans have a physiological response to pollen and dust? I can鈥檛 see any benefit to suffering from sore eyes, a scratchy throat and nasal congestion. So why does it occur?

Wendy Akers, Canberra, Australia

We pay 拢25 for every answer published in 快猫短视频. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淗ay fever fever鈥�