Most mobile device owners are vigilant of the potentially dangerous viruses, malware and general software-based hazards that can steal data, invade privacy, and in the worst instances, cripple beloved mobile devices. But what you may not be so aware of, is the sheer amount of bacteria and bugs that can be collected every single day, and since your device is essentially glued to your hands, you may be a little shocked to learn just how much distasteful matter is willfully attaching itself to your smartphone. One rather compelling study offers a microscopic look at what lies atop the surface of your average handset's display, and if you're of a squeamish disposition, you might want to look away now.