Chullin 108: A Drop of Milk Falls on Meat

Briefly - today's daf uses information from a non-kosher meatball falling into a pot of meat to determine the kashrut if a drop of milk falls on a piece of meat.  Ultimately the rabbis agreed that if the milk fell on only one piece of meat, that one piece can be separated from the meal and the meal is still kosher.  If the drop of milk fell in a pot of meat and the meat was mixed, one would have to determine whether or not the milk accounted for more than one sixtieth of the meal to determine its kashrut.