More Than A Gentle Sea Breeze

Two nights ago I stepped outside and the air was so still that when I held my breath I could hear a moth fluttering at 30 feet ...
If I then blew through my lips and waited a moment, a leaf on a bush 10 feet would move slightly ... (my breath being the only thing to disturb it) ... :o)
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This evening, however, things were a bit different ... :o|