Perhaps the most intriguing possibility of all is that alien life-forms inhabit our own bodies. While observing mammalian cells with an electron microscope in 1988, Olavi Kajander and his colleagues at the University of Kuopio in Finland observed ultrasmall particles inside many of the cells. With dimensions as small as 50 nanometers, these particles were about one-tenth the size of conventional small bacteria. Ten years later Kajander and his co-workers proposed that the particles were living organisms that thrive in urine and induce the formation of kidney stones by precipitating calcium and other minerals around themselves.
Researchers have hypothesized that in alien organisms arsenic could successfully fill the biochemical role that phosphorus plays for known life-forms. Arsenic is poisonous to us because it mimics phosphorus so well; similarly, phosphorus would be poisonous to an arsenic-based organism.
“Most folks are about as happy as they make their minds up to be.”
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