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How close can a weld be to a shoe on a pipeline? The pipe is a 32" and it will be used to transport crude oil, we are in the Houston area.? You roll two standard number cubes. What is the probability that the sum is odd, given than one of the number cubes shows a 4? The half-life of the radioactive isotope U-238 is 4.51 x 109 years. What fraction of the sample will remain after 1 billion years `? Teaching number bonds to 10? If photon is considered an entity ,then what would be an anti photon?