Two years ago we reported on the SolarAid, a low cost solar-powered hearing aid intended for the hearing-impaired in developing countries. A recent article in Newsweek looks at the success of the device and gives a little insight into the mind behind it, Howard Weinstein: Weinstein knew what he had to do: change the business model. Drawing on his years in the corporate bunker, he started working the phones, chatting up financiers, consulting with electronics wizards and haggling with...