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More than 4,000 species are found throughout the world , ranging in size from 4 to 18 millimeters . Laws of motion of any kind become comprehensible to man only when he examines arbitrarily selected elements of that motion ; but at the same time , a large proportion of human error comes from the arbitrary division of continuous motion into discontinuous elements . According to a Nestle study , young people who drank three of the 12-ounce drinks a day burned an average of 106 calories . In base 2 , for example , the digits 1 and 0 would appear equally often . The answer is in the way waves cancel or reinforce each other , depending on whether the crest of one wave meets the trough or crest of another wave . Technically , the reconstruction methods bring together " wavelet theory , frame theory , reproducing kernel Hilbert spaces , approximation theory , amalgam spaces , and sampling , " the mathematicians report .