But there is, I believe, another factor: raising the Medicare age sounds serious, even though it isn't, and it's something you can do, then congratulate yourself on your seriousness.
Osama bin Laden did not help American Muslims by attacking America in Islam's name, but Mr Putnam and Mr Campbell believe another factor is at work: the fact that Muslims, Buddhists and Mormons do not have a place in what people have come to call America's Judeo-Christian framework.
"We believe there's another factor coming from fat in overfed mice that tells the brain to reduce how much you're eating," Ferrante says.
I believe there is another factor too.
Wray believes this factor of overall cost will come more into play over the next few years and will factor more into the decision-making of the CIO.
Paul McGinley, who captained Europe to victory at Gleneagles two years ago, believes the rookie factor may be overplayed.
Stolar told me that he believes it could factor into future cases involving climate change.
Berger believes a crucial factor in the development of 18-23 year-olds is regular first-team football.
For the movie version, at least, he believes the weariness factor worked for him.
