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Science in a Minute 041717 Engineers Figure Out What Causes Shoe Laces to Become Untied

Science in a Minute 041717 Engineers Figure Out What Causes Shoe Laces to Become Untied
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Science in a Minute 041717 Engineers Figure Out What Causes Shoe Laces to Become Untied

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Science in a Minute 041717 Engineers Figure Out What Causes Shoe Laces to Become Untied

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