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what makes your neck hurt when you wake up in the morning

Did the universe cool off or get hotter as it expanded after the 'big bang"?

What is one reason students take sat subject tests

Apopulation of bolts has a mean thickness of 20 millimeters, with a population standard deviation of .01 millimeters. give, in millimeters, a minimum and a maximum thickness that includes 68% of the population of bolts.