INVISIBLE LIFE
The day was warm and sunny, and after lunch I took Tricia into the woods behind the house to explore with her the places I remembered from my own childhood. A dark stream ran through the woodland, and leaves were yellow-green against the fast-moving clouds and blue sky. I pointed out, as my father had to me, the warblers darting among the oaks and maples. The stream swirled lazily over rocks and sodden logs, and for a while we sat upon a boulder and watched the water flow. “Did you know there are tiny creatures in that water?” I asked. “Animals that you can’t see?” Tricia lowered her face toward the pool beneath us. “Are there?” My father had demonstrated the existence of the invisible teeming life by taking a sample of creek water and showing me slides under a microscope. I remembered the elaborate bulbous forms of protozoa and the bizarre wriggling cilia that waved in the droplets of water. “How…
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