A few weeks ago, my family boarded an airplane for the first of two legs of a really long flight. Flying always makes me worry that one of my kids is going to catch someone’s illness simply because we are cramped so close together with hundreds of people and their germs…but what happened throughout the flight with my 9-month-old infant son was downright scary. Strangers that I didn’t know from Adam would pass by our row (where I was seated, ...