By now, summer is all but a memory and the cold winter air will soon blow in. Snuffly noses and hacking coughs will ring through staff rooms and school cafeterias; the loud, barking cry which foretells the coming of Cold and Flu Season. You're one of the lucky few if you don't get sidelined by at least a cold during the winter, because recycled air and lack of fresh air is like a welcome mat to the cold virus. Even if you do all you can to protect yourself - including frequent hand washing …