-Figure 10.11 "U.S. Life Expectancy by Year of Birth" shows a gradual but steady increase in life expectancy in the United States since 1900. What are some possible reasons why life expectancy hasn't spiked at certain periods when miracle drugs were invented (such as the polio vaccine)or when major breakthroughs in medical technology were accomplished (such as the artificial heart)?

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-Figure 10.11 "U.S. Life Expectancy by Year of Birth" shows a gradual but steady increase in life expectancy in the United States since 1900. What are some possible reasons why life expectancy hasn't spiked at certain periods when miracle drugs were invented (such as the polio vaccine)or when major breakthroughs in medical technology were accomplished (such as the artificial heart)?