Porous materials are materials with pores (cavities, channels or interstices). The characteristics of a porous material vary depending on the size, arrangement and shape of the pores, as well as the ...

The entrance of Cougar Mountain Cave where artifacts were found dating back to more than 12,000 years old and where the oldest known sewn material was found. Illustrations and images of sewn hide and ...

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The Environmental Protection Agency rejected the bedrock scientific finding that greenhouse gases threaten human life and well being. It means the agency can no longer regulate them. By Lisa Friedman ...