Although he is a full-time professor, Wall last year opened the Danja Fistula Center in Niger, a 42-bed hospital specializing in fistula repair surgeries with an operating room, outpatient clinic and hostel facilities for about 100 women.

CNN: A fate worse than death for scores of African women

For instance in 2011 the new media artists Julian Oliver and Danja Vasiliev invented a gadget that allows them to hijack the wifi signal in a library or internet cafe, and to remotely edit the content of news sites such as nytimes.com so that anyone in the room browsing The New York Times on a wireless device sees modified headlines.

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