9. Home Safety
The 20th century brought about the first formal efforts to curb hazards in the home. Lead-free paints, building codes, and asbestos removal are some of the dramatic examples, but even subtle changes have been made with safety in mind. "Design changes have steered us toward the ranch-style house versus a multistory house with stairs," Tarr says. "It's simple: Cut down the number of stairs, and you reduce accidents."
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