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And as we are about to see with the DePalma Spinning Ball Experiment and others in the next chapter, many scientists have accurately measured slight decreases in the mass of an object when it is rotating.
(ROOT (S (NP (PRP You)) (ADVP (NP (NP (NN decrease) (NNS errors)) (PP (IN in) (NP (DT an) (NN experiment)))) (IN by)) (VP (VBP take) (NP (JJ many) (NNS measurements))) (. .)))