The invention is an artificial leaf, and it is powered by an advanced solar cell that mimics photosynthesis (the process green plants use to convert sunlight and water into energy). The device is the size of a playing card and is made from silicon, electronics and catalysts - all inexpensive materials that are widely available and highly stable.

It is theorized that the loud sounds of sonar can damage marine mammals' sensitive hearing system..  

That's why bioacoustics researchers are developing intelligent underwater recorders that will allow them to study the effects of man-made noises on marine life and to track endangered species.  

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