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How is the distance between Earth/Milky Way and another galaxy measured? This came up reading an article about identifing galaxies that are very far from Earth. I understand that the Doppler effect...

What is 'fire tape'? Can 'green board' be used on ceilings?

What are the various coatings on nails and screws and what are their uses?

Its doubtful that you will have a reaction after going 3 days with no reaction. You should wash your clothes, etc. The active part of poison oak is a chemical name urishol (that may not be spelled...