Laser-powered vibration test reveals perfectly ripe avocados

As most fans of the leathery fruit can attest, telling when an avocado is of perfect ripeness can be a guessing game, but a new testing technique could eliminate the margin for error by measuring the firmness of individual specimens using lasers.

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“Artificial leaf” device turns water and sunlight into hydrogen fuel

Researchers at Rice University have built a simple new solar-powered device that can create hydrogen for fuel by splitting water. It's similar to other “artificial leaf” designs but the team says it’s self-sufficient and relatively cheap to produce.

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