An Electrifying Startup
A new lithium-ion battery from A123 Systems could help electric cars and hybrids come to dominate the roads.
By Kevin Bullis
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Hybrids, plug-ins, and extended-range electric cars are hitting the market. Use this interactive primer to learn how they work.
The philanthropic effort dubbed the $100 laptop has not met its grand initial goals. But its first deployment, in Peru, may turn skeptics into believers.
By David Talbot
Thousands of U.S. soldiers have survived powerful explosions in Iraq. Many are returning home with brain injuries that could result in long-term disabilities.
By Emily Singer
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September 23-25, 2014