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A reusable, electrically propelled spacecraft would open up vast realms of deep space to human exploration. The interactive below provides a walkthrough of the proposal laid out by Damon Landau and Nathan J. Strange

Monday, November 14 Build a game, and they will play--and pay. Of the 62 million Americans who will log game time on a social network this year, some 10% will open their real-world wallets to buy virtual goods. That small percentage is nothing to scoff at, says Paul Verna, analyst at eMarketer.

Looking for the Web Exclusive mentioned in the October 2011 issue of Scientific American ?

In conjunction with Scientific American ’s special September 2011 issue on cities, we present an archival look back at the documented growth of urban environments. [More]

Wednesday, June 15 Though they may be loath to admit it, most attendees at this New York conference are sure to be pondering the same question: How do I get more followers on Twitter? We turned to social-media scientist Dan Zarrella, who has analyzed millions of tweets (and earned 33,000 followers of his own), to get some answers.

The students, alumni, and professors at MIT are a brainy -- and busy -- bunch. To mark the university's 150th year, we tracked a handful of smarty-pants with ties to the school. Infographic: MIT's 150th Birthday