On Jul 3, 6:13*pm, lu6etj wrote:
... then I asked
you if you can hear sound 80 dB below insect shooting your window.

That reminds me of the medical profession two hundred years ago when
doctors believed that there was no such thing as a virus because they
couldn't see it and besides that, how could it possibly exist and be
alive without a cellular structure?
--
73, Cecil, w5dxp.com