Credit Cards and Food Trucks?

So I've been noticing lately more and more food trucks are accepting credit cards! How? With an ipad or iphone. Technology is crazy! Thank goodness we live in 2011! What is that green stuff-I barely even carry it anymore-plastic all the way. Back to the point I was trying to make-food trucks and credit cards-its all possible because of square! This small square device just attaches to the phone or ipad and you can swipe the card and the credit card holder signs with his/her finger.
 A receipt can then be e-mailed or texted to the customer. Pure Genius!!! Check out this video to learn more about square!