check for fatalities then exchange insurance
Act calm, and don't over think the conflict unless it's really bad (cheating). Try to get your differences together, without war/violence. Or "proving who is better/has a better argument".
The answer is osteoarthritis.
One of the main reasons why life expectancy dramatically rose in the past century was due to different factors. One that surely contributed to them was better access to medical equipment and medical advances themselves. As well as better nutrition that was available to the common person.
