evidence: This story is an old one, but it’s been making the rounds again recently, about a Danish 9th grade class that tested the germination of cress seeds placed next to Wi-Fi routers versus those grown away from such signals. In the experiment, the seeds near the routers fared much worse, as illustrated by the picture on the left above, barely sprouting at all while the others were very green. It looks like the seeds were very badly damaged by the Wi-Fi signals, but were they? From the experimental design alone, we can say probably not. This post breaks down the problems with the Danish experiment better than I ever could. The highlights include not paying attention to temperature, not reporting that a second group of seeds with Wi-Fi signals did just fine, and, most egregiously, misrepresenting the results in the above photo to make it look worse than it was. With all due respect to the budding 9th grade scientists, there are serious problems with this experiment that prevent any real conclusions from being drawn. [...] The bottom line is this. If anyone ever managed to produce clear and convincing evidence that cell phones and Wi-Fi signals caused cancer or any other serious health effects, then we would have to go back to the drawing board and seriously rethink the laws of particle physics and run lots of new experiments down at the chemical and molecular levels to figure out just how electromagnetic signals that weak can possibly damage cells. Until and unless such a thing occurs, I’m not worrying about my wireless.