It seems like every generation should live a bit longer than the last, right? We invest so much time and money in technology, medicine and related fields. We understand the human body in ways people couldn't fathom not that long ago. Many medical technologies that seemed like science fiction to our grandparents are now very real.
However, the reality is that life expectancy in the United States has continued to fall. The drop isn't big -- a tenth of a year, in one study -- but it's still going to wrong way, doing the opposite of what you would expect. Why is this?