Adrift in the Aeolian Zone: The Earth’s atmosphere supports a wealth of life from transients like spiderlings adrift on gossamer threads of silk, fungal spores, and plant pollen to resident bacteria. In Colorado we might see Ponderosa pine pollen (three-lobed structure in fore and mid ground), milkweed pollen (“life savers†near bottom of the picture), and football-shaped Arabidopsis pollen (just to the right of the spider).