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Nanoporous silicon that soaks up ions without self-destructing can make better batteries.
Self-propelled microbots navigate through blood vessels.
A hybrid refrigerator will bring efficient, cheap cooling to India.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.
Researchers show a low-cost route to making materials for advanced batteries in electric cars and hybrids.
The senator’s proposed $300 million prize for an electric-car battery prompts excitement, skepticism.