That question reveals which Internet companies are inspiring the most optimism among investors.
In the wake of Facebook's billion-dollar Instagram buyout, video-sharing apps are jostling to become the next big thing.
After letting its employees use their own phones and tablets for work, the company confronted a flood of insecure apps from the open Web.
Yes, of course, but things got out of hand. A quarter of executives admit to having slept with a smart phone.
At its electric-car factory in Silicon Valley, Tesla obsesses over details like making its own high-tech tools.
Photographs by John Stocklin
A look back at the moments that have shaped Facebook's success.
Running the world's largest social network will be a technical and financial challenge as it grows.
Delphi says its diesel-like engine runs cleanly on gasoline.
It's the first study to show that brain chips can assist paralyzed people to perform complex real-world tasks.
A startup blends activity tracking with online incentives in hopes of getting kids into shape.
The company is losing money fast. It hoped to raise money to stay afloat.
A wearable brain scanner could give computers insight into how hard you're thinking.
A new type of eye implant requires less hardware and could restore more vision than existing devices.
The proof-of-concept device concentrates sunlight to break apart limestone.
Peratech thinks printable electronic sensors of volatile compounds could find their way into textiles.
A Technology Review Special Report focusing on innovations in alternative energy sources and the technologies driving them.
Our list of the 10 most innovative technologies of 2012. See list »
Under the right circumstances, solar cells from Semprius could produce power more cheaply than fossil fuels.
By Daniel J. Kleitman, Norman C. Rasmussen, Richard B. Stewart, and Joel Yellin
A panel discussion on nuclear risk, the lessons of Three Mile Island, and the future of nuclear power.
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