ARE ALIENS AMONG US? "After a two-year study at California's Mono Lake, near Yosemite National Park, [U.S. Geological Survey biochemist Dr. Felsia] Wolfe-Simon found that a bug will grow in the presence of the toxic chemical arsenic when only slight traces of phosphorous are present."

Well, arsenic is poisonous to nearly all forms of life on earth, so I guess that an arsenic-based lifeform is alien. But I think we already have aliens among us - we just call them "progressives."