Every bit of steel in the car you drive has been measured as to its capability to withstand certain forces — pushing and pulling. Machines like this do the measuring. Jennifer Lauren Lee/NIST PML hide caption

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How Do You Lift A Million Pounds Of Stainless Steel? Very Carefully

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Sylvester Williams, a Denver Broncos nose guard, nabs Isaiah Crowell of the Cleveland Browns last October. If measured by BMI, Williams is obese. AAron Ontiveroz/Denver Post via Getty Images hide caption

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If BMI Is The Test Of Health, Many Pro Athletes Would Flunk

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Government workers exercise at their office in Mexico City, August 2013. To counter the obesity epidemic, the city requires all government employees to do at least 20 minutes of exercise each day. Tomas Bravo/Reuters /Landov hide caption

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Overweight People In Developing World Outnumber Those In Rich Countries

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Posting a picture like this on the fridge might seem like good motivation for weight loss. But scientists say it might instead inspire weight gain. iStockphoto.com hide caption

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Can Skinny Models Undermine Your Dieting Goals?

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