If you're prone to serious allergic reactions, carrying an epinephrine shot (such as an EpiPen) could be vital. Those shots are often bulky, though, and there's a real chance you could lose yours right before you need it. Students at Rice University have a (relatively) simple solution: put the shot on your wrist. They've developed a wearable, the EpiWear, that hides a foldable epinephrine syringe in a device not much larger than a watch. If you're in an emergency, you just need to unfold it, flick a safety lever and push a button when you're ready to inject the medicine into your thigh.