From the article:

A 200-pound person falling from a height of only six feet hits the ground with almost 10,000 pounds of force. Falls led to 197 of the 595 construction deaths recorded in 2012, according to CPWR-The Center for Construction Research and Training. Through the first quarter of 2013, falls caused 37 of 95 recorded construction fatalities. One of those was Steven Klafke, an employee working on the second floor of a residential home in Mequon, Wis., who fell to the lower level while dissembling a scaffolding.

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