Wash your hair before going to bed as pollen can get caught in your hair when you are outside.

So how do you train them to respond to TNT the way they respond to pollen?

This is because the protein found in birch pollen to which people are allergic is very similar to proteins found in the flesh of apples.

You should also consider keeping pets out of the bedroom if they’ve been outside, as pollen can cling to their fur.

In a tropical forest, for example, the advantages of insects are great: they provide highly targeted pollen-delivery in a complex milieu.