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Activity 5.2.1 ï Bones - Remarkable example of engineering combining light weight, flexibility and incredible strength. ï lb per lb stronger then concrete ï Every 7 years a healthy body completely replaces every bone cell in the entire body keeping them strong. ï Constantly remodeling ï osteoblast ï osteoclast ï Who in the class has ever broken a bone. ï How does human skeletal system protect us ï Human Body: Pushing the Limits video on strength available at http://dsc.discovery.com/tv/human-body/explorer/explorer.html. ï Alternatively, view the clip on DVD. The clip is located on the Strength DVD â Chapter 2 â 1.15.