From cancer treatments to self-cleaning windows and clear solar panels, nanotechnology is revolutionizing medicine, renewable energy and computing. Chemists Mark Ratner and James Gimzewski discuss what's special about nanoscale particles, and how they may shape the future.

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In the U.S., more than four in five adult Internet users make use of social media offerings at least once a month, and half use social networks like Facebook, according to a new report. Sean Corcoran, an analyst with Forrester Research, says that online life isn't just for young people anymore.

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With students back on college campuses, schools are planning for swine flu outbreaks. James Turner, president of the American College Health Association, describes some of the steps educational institutions are taking, from bolstering student health clinics to preparing large-scale vaccination campaigns.

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Since the development of the Prostate-Specific Antigen (PSA) test for prostate cancer, early detection and early treatment has been the norm. Martin Sanda, author of a study in the Journal of Clinical Oncology, says that for some low-risk tumors, "watchful waiting" may be a viable treatment option.

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The New York Hall of Science in Queens opened an unusual mini golf park this summer. Every hole illustrates a different scientific principle. Charles Camarda, a NASA engineer and former astronaut, agreed to play a round and explain some basic space science as he putted.

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