Cathy Hogan is a research scientist and medical engineer at MIT. She's come up with a needle-less injection technology that could change the world. The hand-held device delivers medicine in a fine liquid jet and can even adjust the depth at which medicine is injected. At the moment there are plans to make medicine in powder superfluid so it too can be injected into the bloodstream. For anyone scared of needles, or in environments where sanitation and hygiene can be a problem, let alone the many different types of treatment it offers, the device could be a modest health care revolution.