Riddle: I can make you feel light or weigh you down, though I…

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i-can-slow-you-down-or-speed-you-up-but-im-not-time

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i-am-a-color-without-hue-both-dark-and-bright-what-i

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i-am-a-force-that-cannot-be-seen-yet-i-pull-everything

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i-am-taken-by-surprise-but-i-help-you-see-can-both

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i-have-a-twin-thats-far-from-dull-we-move-in-waves-yet