Google debuts mobile-pay service in second try

Google's answer to the Apple Pay mobile-payment service is debuting in the U.S., marking a do-over by the company behind the world's most-used operating system for smartphones.

Electron trapping harnessed to make light sensors

Traps. Whether you're squaring off against the Empire or trying to wring electricity out of sunlight, they're almost never a good thing. But sometimes you can turn that trap to your advantage. A team from the University of ...

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