For the social-entrepreneur CEO of Belu, pursuing a purpose might be easier if he pursues a profit too
Using RFID, one firm makes sure that sponges don't go home with surgical patients
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AbTech's founder couldn't sell his pollution solution to Big Oil. Turns out that big cities need it more
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Nonprofit RealBenefits realized its software could help more people only if it got greedier
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A young company seizes its chance in the craze for Indian movies and music
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