This is the season when we send our kids off to school with shiny new backpacks, and every year, they bring home the same thing: The first round of back-to-school colds. In our house, with a two-year-old intent on drooling on everyone he touches and a six-year-old still perfecting her personal hygiene practices, pathogens are passed out like hugs, and it's only a matter of time before the whole family is sick.