Swatting

An aeronautics professor at CalTech has spent fifteen years studying the evasive flight behavior of houseflies. To combat this nuisance he recommends the following:
- Use a long handle swatter.
-Try for minimal distance i.e. creep up on them.
-Try not to be visible.
-Use a clear and non-reflective swatter if you can find one.
But the good professor personally uses a rolled up newspaper!
This mention of houseflies recalls this tongue-twister:
-A flea and a fly in a flue -
-were imprisoned, so what could they do?
-Let us flee said the fly - fly away said the flea -
-So they flew thru a flaw in the flue.
tjs (NYT 8/8/20)