Giving your zip code along with a credit card purchase is common practice. It happens at the grocery store, at the gas station, at some of your favorite clothing shops. Most of us don't think twice about it; other more paranoid patrons will give a fake zip if they can get away with it. But what are those paranoid purchasers so scared of? Why do stores ask for your zip code in the first place?

Even if this year's iPhone 5 doesn't incorporate the much-hyped Near Field Communication (NFC) capabilities, a future without credit cards is pretty much guaranteed. But don't go cutting up your prized plastic just yet. A complete system overhaul is still a ways off.

How is a credit phone possible?

NFC – the tiny chip inserted in your smartphone or smart device that allows a purchase or transaction to be made simply by waving your device near a reader – has been a hugely successful technology in some parts of Asia and, in a much more limited scope, have popped up here and there in the US and Europe. The chips can send and receive data, and if attached to your bank account will deduct payment on the go, letting you charge as you chat.

I've had a free checking account with WAMU (now Chase) since 2004. And while I've never used it as my primary checking account, I did maintain a decent balance while running several transactions through it each month. Frankly, it was just nice to have around when I needed it, and I probably would've never thought about closing my account had it not been for a letter I received from Chase a few weeks ago.

How many germs and contaminants are on money? A whopping 92% of all dollar bills have traces of cocaine, which bonds to green dye.