Delaware tips the least (14 percent). Alaska tips the most (over 17 percent). And for cities, Denver tips the most. Fun with studies!

Check out the map above. It's based on data from Square -- more on that in a second -- summarized here and here. The data looks at tipping across America, and on the second link, you can see every state ranked; Alaska tips the most and Delaware tips the least. In general, the range is 14-17 percent. Apparently, consumer behavior professors in America be…