3-D Printing

New 3-D Printing Technique Makes Ceramic Parts

A new way of making these tough materials could be a key step in producing better airplane engines and long-lasting machine parts.

• by Katherine Bourzac

Internet access

Remaking Social Media for the Next Revolution

A hero of the Egyptian revolution laments the limits of social media and hopes to improve online dialogue.

• by Zeynep Tufekci and David Talbot

Security and privacy

Do We Deserve Total Digital Privacy?

A quarter-century ago, a “protracted battle” over encryption began between law enforcement and civil-rights activists.

Software

AI Hits the Mainstream

More industries are looking for ways to use artificial intelligence. What will that mean for the technology’s future?

• by Nanette Byrnes