[Off topic] One of my clients is running a Kickstarter campaign to fund their project: SCiO reads the chemical make-up of materials. It is a non-intrusive, no-touch optical sensor that connects to your smartphone. You can analyse your food (what is in it?, is it fresh?), medicines,  hand bags (is it real leather?), etc. With almost $1.5m in backing it is now one of the top 40 funded projects ever on Kickstarter. Check it out.