Editor's Note: This is the second article in a three-part series examining a trio of emerging threats in 2011, each with the potential to impose seismic change upon the risk-management landscape. The first article asks "Will Insurers Dodge Climate Nuisance Liability Bullet."

Nanoparticles are extremely small objects, measured in terms of nanometers—equivalent to one billionth of a meter. In recent years, the use of engineered nanomaterials in consumer products such as sunscreen, cosmetics, clothing and baby products has soared.

These materials are sometimes small enough to enter the human body through the skin and through inhalation. As a result, substantial concern has developed because these tiny materials are often made of toxic substances—and closely resemble asbestos fibers.

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