Thanks to a new art/science exhibition called "Blood Wars," you can find out whose dad has the toughest immune system once and for all. The brainchild of artist Kathy High, "Blood Wars" pits white blood cells from two different people against each other. From the article: "In order to create the blood duel, High gets a phlebotomist to take blood samples from two different people. She then separates the white blood cells from the rest of the blood and stains them using different colors. They are then placed in a Petri dish and their interactions are filmed under a microscope using time-lapse microscopy. The cellular 'winner' of each round will go onto fight another participant."