When there's radioactive meat drifting into your supermarket, you might want a way to screen it yourself. And if you're in Japan, getting your hands on a geiger counter can be tricky (and expensive). This Kickstarter has a solution.
The Smart Radiation Detector's creators say they can sell the thing—a small black box that plugs into your iPhone's audio jack—for just $50, as it uses a cheap radiation-detecting diode instead of a Geiger-Muller tube. But it's still sensitive enough to detect even trace amounts of radiation, and visualizes it neatly with an accompanying iOS app. They're almost at around a quarter of the funding goal, with 18 days to go—so throw a little change their way if you dig the idea. [Kickstarter]