“Taking advantage of improved artificial joints and surgical methods, aging Americans are getting so many new hips, knees, shoulders, and ankles that orthopedic surgeons are having trouble handling demand.” Boston Globe: Boomers line up for joint replacements, and their expectations are high. (This is just one more unwelcome reminder to both of us that my fingertips can’t last forever…)

+ Related: When 26.2 miles just isn’t enough – the phenomenal rise of the ultramarathon.