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Many states have mercury levels in the rain that exceed the danger for humans.

The leaves attract iron oxide particles on the surface, making them magnetic. So they can become inexpensive sensors that assess pollution.

European stores and supermarkets will not be allowed to sell 100 watt incandescent bulbs from early next month.

In the world, more and more children are experiencing respiratory problems such as coughing, shortness of breath and asthma.