Adulthood begins at age 26, at least according to a recent survey. That's not too far off from the old joke, "To the Catholics, a fetus is a human being from the moment of conception. To the Jews, a fetus is still a fetus until it graduates from medical school." (Before anyone sends me an indignant e-mail, this joke was told to me by one of my Jewish physician colleagues.) Link via Weigh In.