Letters to the editor from the September 2012 issue of Scientific American
Also: burning nitrogen, cancer clue in Down's syndrome, and gallons per mile
Also: ants: "I'm not dead yet," a lower high-water mark, working on the railroad, and temptation zone
Also: ending nerve damage from needles, "caveman" connection to humans, electromagnetic chatter, and laser beams that curve
Also: self-medicating bugs, apes that plan, mesh that floats and brain bias in vision
Also: Heating genes with sonic waves, cannibalistic beetles, calcium in the ocean, and more...
News Scan Briefs: Explaining the Aperture Illusion