Students ordered to wear masks in smog-hit Lahore

Authorities in Pakistan ordered schoolchildren in the smog-smothered city of Lahore to wear masks during lessons starting Thursday, an effort to protect against hazardous levels of polluted air.

Light-activated molecular machines get cells 'talking'

One of the main ways cells "talk" to each other to coordinate essential biological activities such as muscle contraction, hormone release, neuronal firing, digestion and immune activation is through calcium signaling.

Latest sandstorm brings Iraq to standstill

Another sandstorm that descended Monday on Iraq sent at least 2,000 people to hospital with breathing problems and led to the closure of airports, schools and public offices across the country.

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Heart disease

Heart disease or cardiopathy is an umbrella term for a variety for different diseases affecting the heart. As of 2007, it is the leading cause of death in the United States, England, Canada and Wales, killing one person every 34 seconds in the United States alone.

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