[iotadeltagamma]

Why Bruce Ames? Bruce Ames is long retired, and his research was on the free radical theory of aging, which is largely seen as a dead-end for the past 15 years after it was realised that merely throwing different antioxidants into the works gummed up the normal function of reactive oxygen species and did nothing or worsened aging.

[LinuxBender]

Actually he still does a lot of work and is currently researching theories around "conservation". e.g. when the body is low on a particular micro-nutrient, it conserves delivery on particular pathways that are related to longevity.

So while he may have "retired", I mean, he's 90, so it's about time, he most certainly still works full time in the lab.