Sun + Water = Fuel
With catalysts created by an MIT chemist, sunlight can turn water into hydrogen gas. If the process can scale up, it could make solar power a dominant source of energy.
By Kevin Bullis
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An Indian startup thinks that the right software can make cheap phones a financial lifeline to millions.
By David Talbot
Dan Kaminsky got people to fix a fundamental security problem in the Internet. We were lucky this time.
By Erica Naone