HEATKEYS

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Make toys at home with common household materials, often in only a few minutes, that demonstrate fascinating scientific principles.

Environmental Working Group (EWG) works to protect kids from toxic chemicals in our food, water, air and the products we use every day. We use research to help create federal policies that protect our children, our health, and our natural resources.

MATHESON: Provider of specialty gases, gas handling equipment for gas detection, purification, management and control, safe delivery sources, and portable gas solutions.

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Praxair, Inc. a worldwide provider of industrial gases, including atmospheric, process and specialty gases. Praxair helps virtually every industry improve product quality, boost performance and benefit the environment through the application of atmos...

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Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.