Millions of households use microwave ovens for cooking. But some people worry that they may pose a risk. What do experts say about the impact of these common kitchen devices on our health?
Global warming has changed city life in Phoenix: When it gets too hot, construction crews start work at 4 a.m. and the zoo opens at dawn. But for some people, the heat is more than an inconvenience. It can turn deadly.
Every year around the world, almost 8 million people die prematurely as a result of air pollution. The air quality in Europe is well monitored, but there is an urgent need for concrete data on pollution in West Africa.
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