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Once thought too polluting, the two-stroke engine makes a comeback in advance of stricter fuel efficiency standards.
The advanced fuel cell could eliminate range anxiety and make electric cars more practical, while keeping carbon-dioxide emissions low.
Levant Power saves fuel by turning road shocks and vibrations into electricity.
Wireless connections in cars are becoming faster and more capable, bringing new features, new services—and new problems.
Wireless vehicle networks could make driving safer and more efficient, but the cost of deployment will be significant.