Here's a neat genetic trick: Make a chicken that can get the flu, but can't pass it on to other birds - or, presumably, to the humans who take care of them.

Nearly all conventional flu vaccines are made by growing the virus in chicken eggs, a slow process that is even slower with some strains - including 2009 H1N1 flu.

While this was the first study to look specifically at the effects of hot drinks on cold and flu symptoms, others have looked at hot foods like chicken soup and had similar results.