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Chemistry

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before and after daguerreotypes

BIG REVEAL To the naked eye, the woman in the damaged daguerreotype (left) looks ghostly. A synchrotron helped researchers restore her portrait (right).

oil spill

JUST ADD SUNLIGHT  Oil swirls at the water’s surface after the 2010 Deepwater Horizon oil spill. Sunlight transformed the oil molecules on the surface into new molecules that are still sticking around.

plastic stacked up in landfill

POLLUTION PROBLEM  While some plastic is recycled, most ends up accumulating in landfills. Plastics that are easier to recycle could help change that.

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