Originally posted on TED Blog:

Please enjoy your weekly roundup of TED-related news:

This week, the New York Times took a look at Krista Donaldson’s nonprofit, D-Rev, which designs medical equipment for the developing world. (Watch her  talk about their $80 prosthetic knees.) The article reads, “D-Rev is one of dozens of small Silicon Valley start-ups aiming to use market dynamics to solve social problems. But seven years after its founding — and a decade into the rise of ‘social entrepreneurism’ — D-Rev and its peers have found that the marriage of nonprofit motives to for-profit markets can be rocky. D-Rev has had to become far more involved than it expected in financial models, licensing deals, consulting services and manufacturing arrangements. In essence, it is redesigning not only high-tech products but also supply chains and procurement systems.”

P.W. Singer was featured on NPR’s Fresh Air on Tuesday to talk about his new book,

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