Carl Ledbetter, J`r., age 11, for his question:

How do the holes get into Swiss cheese?

Swiss cheese seems to be frozen solid around a flock of empty soap bubbles, You cannot see how anyone could scoop out those round holes, for the solid cheese surrounds them on every side. Well, the job was not done by human beings, It was done by bacteria, too small for our eyes to see, As the cheese ripened, these tiny creatures were busy eating, breathing and multiplying in the mixture.

As they lived, the little creatures changed the milk into deliciouscheese.  In the process they gave off quantities of carbon dioxide gas.  This gas could not escape through the cheesy mixture. It remained trapped in round pockets. The cheese finally set hard and firm and the bubbles of gas were left trapped here and there inside it.