Today is National Coffee Day in the U.S., meaning you can get your coffee fix at several coffeehouse chains without shelling out a dime. Among the ones giving out freebies is Dunkin' Donuts, where you can snag a free medium cup of hot or iced dark roast coffee. Peet's Coffee & Tea is giving consumers a free small cup of Peet's Major Dickason Blend with any purchase of a baked good, outmeal, or fresh food item. At Wawa, you can get free coffee in the size of your choosing. And Krispy Kreme is giving out free small coffees and glazed doughnuts, as well as $1 discounts on other drinks. Interestingly, Starbucks -- the largest coffeehouse company in the world -- isn't giving out any freebies. Instead, it will donate 70 cents -- the price of one coffee tree -- to coffee farmers for every bag of coffee purchased by customers in U.S. stores. The effort strives to alleviate two problems facing coffee farmers: aging trees, as well as a fungus called coffee rust that...