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sustainable energy
After a nine-month delay, the solar-powered plane Solar Impulse 2 has resumed its flight around the world.
The founder of 5-Hour Energy hopes to solve the developing world’s most pressing energy concerns with stationary bikes, but can his idea be implemented sustainably on large scales?
A new wearable uses human pee to generate enough energy to transmit radio signals to a receiver, providing a potential aid for wayward hikers.

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