Pre-Tax 401(k) calculator, which can factor in the effect of investing pre-tax savings in a taxable account (Option 2).

FORBES: Why the Pre-Tax v. Roth Decision is More Complex Than It Seems

As readers have pointed out here on Forbes, even though the company has been criticized for its patent actions, the lack of an iPhone 5 wow factor, and its new mapping service, pre-sales of the iPhone 5 quickly went over the 2 million mark.

FORBES: Connect

Also, he said, the people who have died in Mexico could have had what he called "another co-factor, " such as taking medicine or having pre-existing infections that would make them more vulnerable.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?

Carbon dioxide emissions come from energy use, and energy is the key factor that makes modern economies so much more productive than pre-industrial societies.

FORBES: Carbon Tax: Will Tweedle Dum Snatch Defeat From the Jaws of Victory?

Two questions were key: Have mean global temperatures risen compared to pre-1800s levels, and has human activity been a significant factor in changing mean global temperatures?

CNN: Surveyed scientists agree global warming is real

The stock market no longer is a plus factor in adding to personal wealth which made back half its way to the pre-2007 highpoint.

FORBES: This Is The Way The World Ends

It can cover that if airfares and its load factor--industry jargon for the percentage of seats filled--return to pre-Sept. 11 levels.

FORBES: Is There Such a Thing as Nonstop Growth?