In the United Kingdom, the more mobile phone towers a county has, the more babies are born there every year. In fact, for every extra cell phone tower beyond the average number, a county will see 17.6 more babies. Is this evidence that cell phone signals have some nefarious baby-making effect on the human body?*Buy concert posters at eBay.
Nope. Instead, it's a simple example of why correlation and causation should never be mistaken for the same thing.