Ordinary Portland Cement (OPC) is a fine, gray powder made from a blend of limestone, clay, and a few additional minerals When it comes to choosing the right cement for a construction project, OPC ...

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Speaking in the Oval Office, President Trump vowed to lower oil prices even as new strikes on Gulf energy sites drove them to record highs. Pentagon Seeks $200 Billion to Fund Iran War The request, ...

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Smithsonianmag.com accepts unsolicited proposals from established freelance writers. This form has been developed to give you the most direct and timely access to our editors. It also allows you to ...

Nature Portfolio is here to serve the research community by publishing its most significant discoveries—findings that advance knowledge and address some of the greatest challenges that we face as a ...

For a definitive list of which limits are mandatory please visit the submission checklist page. We allow the use of up to 6 keywords/key phrases that can be used for indexing purposes. These should ...