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• Q&A: Bill Gates
  Microsoft’s cofounder vows to change the “supply side” for breakthrough energy technologies by investing billions of his and his friends’ dollars.

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• Video: Filtering Drinking Water with Nanofibers
  This water bottle filter, made from nanofibers, can reduce water-borne diseases.

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• We Still Haven’t Found a Fountain of Youth in Our DNA
  Study of exceptionally healthy old people fails to trace their well-being to specific genes.

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• How First Solar Is Avoiding the Industry’s Turmoil
  The Arizona company is betting that cadmium-telluride solar cells could leave silicon in the dust.

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• New 3-D Printing Technique Makes Tougher Ceramics
  A new way of making these tough materials could be a key step in producing better airplane engines and long-lasting machine parts.

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• How to Prevent a Plague of Dumb Chatbots
  The best (and least annoying) chatbots will be those that recognize their limitations, and occasionally turn to humans for help.

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• 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.

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• How Political Candidates Know If You’re Neurotic
  The latest data-driven campaign pitches target you based on your personality, not just your demographics. But does such profiling work?

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• Why a Chip That’s Bad at Math Can Help Computers Tackle Harder Problems
  DARPA funded the development of a new computer chip that’s hardwired to make simple mistakes but can help computers understand the world.

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• The Extinction Invention
  A genetic technology that can kill off mosquito species could eradicate malaria. But is it too risky to ever use?

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