"Why are all these eggs on the table?" David asked, as he walked in breathless from school one day.

"Because I'm baking a cake," his sister Sara answered.

"Look," David said to his brother as he grabbed an egg. "Do you know how to check to see whether an egg is hard boiled or not?"

"Well you could crack it," Ben said thinking very practically.

"Do you see?" David said as he spun the egg like a dreidel. "You see it can't really spin. It's wobbling, which means that it's not boiled. If it was a hardboiled egg, it would spin quickly and smoothly."

"Did you know," Ben said, "that if this would be a non-kosher egg, like an owl's egg, and it would fall into a pot of food, then the whole potful of food would become non-kosher?"

"Really?" David said, furrowing his brow in thought. "But I thought that if you had kosher food which was sixty times the amount of non-kosher, then the little bit of non-kosher food is neutralized and the whole thing is kosher. So if an owl's egg fell into a pot of food, very likely the pot would have sixty times as much as the egg, and then it should all be kosher!"

"Very good," Ben said smiling. "You will make a good mathematician and a good rabbi. But the thing is that an egg is considered a special food and therefore the neutralization rule does not apply."