How to cool large dishes safely

For how many hours can you leave out a Christmas ham? Will turkey stuffing give you the runs? Is it okay to refrigerate hot take-away fried rice? Why does America have the world's worst E. coli? Can soft cheese really kill unborn babies? Why does asparagus make your pee smell?

Every Christmas, families sit down to feasts... and Josh sits down with one of his favourite regular guests, Gary Kennedy. Gary is a food scientist who knows everything about the microbiology of what you eat, and what you shouldn't. Merry Christmas, humans. Bon appetit!