Can't make it out for a Whopper? Burger King just might bring it to you. The fast-food chain has begun delivering to homes in Washington, D.C., USA Today reports. If the test goes well, the King may expand the service to other cities. Home delivery has always been a challenge for the food and beverage business. Pizza restaurants obviously have found success, but burgers and fries don't hold up quite as well in transit. They also lose some appeal in the microwave. Finally, the size of a fast-food order isn't normally large enough to justify the expense of delivery. So...