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An alternative to batteries gets an advance from tiny, crumpled sheets of graphene, whose electrodes can store more charge because they have larger surface areas.
Apps that track how people use their phones could help make the devices more efficient.
Virus-based nanowires are the key to making valuable chemicals out of methane, says Siluria.
A battery will capture power from braking trains.
Founder of A123 Systems starts a new company to commercialize the technology.
If federally funded factories don’t get enough demand, even more government spending could result.